Alright, kids, this is going to be a constantly updated post. I'm going to be putting not only what I know in here (or suspect at least, heh), but also any reader tips I get. Eventually I'm going to go through my books and bookmarked websites and put some actual numbers up here, but for now I'm just going to run down the basics. If you have any tips you want to share just leave them in the comment section and I will add them, with attribution of course.
Ficus benjamina is a tropical, but it's very popular as a house plant since it can thrive year round indoors. It's also often used for bonsai. So, here's what I know off the top of my head.
Light: Ficus benjamina likes lots of bright, indirect sunlit although some direct light is ok. No more than a couple hours of direct light a day, though. I've had good luck with grow lights too.
Water: They like it moist, but not sopping wet. You should water them when the first 1/2" or so of soil is dry. I'll be putting better details up on this up eventually, since over watering is one of, if not the top killers of house plants. Now, you've probably heard this before, but don't put them (or any houseplant) on a regular watering schedule, that's wicked bad for them. Water them only when they need it.
Temperature: Ficus benjamina like it warm, being a tropical. I've always heard they need to stay above 55 degrees F, but I once had some cuttings sit in an unheated room in an apartment in Boston in December for a week and they all survived. It definitely dropped below freezing many times. I still try to keep them above 55, usually around 57-65 in the winter and who know what in the summer, maybe 75-90s. I live in New England, we get pretty thorough temperature fluctuations.
Humidity: They love humidity, freshly rooted cuttings in particular really want a humidity tent. If the humidity is high enough they will put off air roots too, which are wicked cool. Although I did once make a humidity tent that was too tightly sealed and almost killed one of them. It got all moldy, it was weird and gross. I washed the ficus off and gave the tent better air circulation and it survived just fine though.
Food: Honestly, I don't feed them that much. I've used liquid fertilizer but didn't like it. I've also used that MiracleGro constant feed potting soil. When I used that I used it cut with regular soil since I've heard that it's a bit much for ficus' on it's own. It's worked well for me so far, the tree's are all growing.
The picture up top is my first one, I call her the Mother Tree. My sister in law gave her to me, all my benjamina cuttings have come from her.
I like ficus benjamina a lot, partly because of the one in my dining room when I was a kid. My mom has always been very fond of them and our dining room had lots of windows. There was a corner that got constant, bright, indirect light, it was perfect and the tree loved it. Heh, I remember my dad complaining once that it was too big when it was hitting the ceiling, which was really pretty high. My mom said that that's the way she liked it. It was almost always touching the ceiling. One of my childhood cats liked it too, but for a litter box. We eventually had to cover it with rocks too big for her to dig at easily. She wasn't very well behaved.
This is a little arch, although it didn't quite come out like I wanted. 
Here is a section of "field stone" wall. 
And lastly a slate path. 
Or wall, whatever I decide to do with it. I made the wall and arch with craft pebbles and superglue and the path is a broken up slate flooring tile. Also with super glue (SG). Because they're held together with glue I think I'm going to make sure to take them out of the pot before watering, once I have them set up. But I think SG is waterproof, I mean they use it in aquariums. But I guess we'll find out. Heh.
One of the leaves had fallen off and started putting out roots and leaves all by itself. Really. It's that easy. Take a leaf, lay it on some dirt. 
Wait. Then pretty soon (in plant time) this. 
Love it. Jade plants are not only wicked easy to propagate, but they are eay to care for and can be turned into bonsai as well.
I'll do another post at another time about care for them.
Not too shabby, huh? He's about 3' tall now and doing fine. The plan is to just let him do his thing and see what happens.
Good roots, it's ready to go. Just fill a starter pot ~1/3 full of soil. 
Put the cutting down carefully, try to get the roots as evenly spread out as possible. 
Now carefully cover it with more soil, water it well and put it in bright indirect sun. 
You won't need to water it much for the first few months (over watering leads to root rot, repeat as needed for emphasis), it takes a while to get a good root system, but keep an eye on it and don't let it dry out all the way.
Yes, it took a long time to get this far, but if I had kept it in a warmer, more humid environment it would have gone much faster. Probably about half the time. Putting cuttings in a humidity tent isn't a bad idea, although you have to keep an eye on them to make sure it's not too humid and they get moldy.
At this point you need to be very careful when you change the water, the roots are very delicate and can be broken off even by pouring water over them.
Pretty Cthulhuian, huh? You just submerge that in some water, changing it every week or so, and after a couple weeks it puts out roots. 
You can let them get several inches long if you like, it helps the plant get started. 
But part of spider plants popularity is their cockroach-like survivability and I've found that an inch or two of root is plenty. Then you just take a small pot half full of dirt and put the rooted node gently on top. 
Cover it with more dirt, 
water it thoroughly and put it in a sunny, but not too direct, spot.
That's it, pretty soon this one will be putting out babies of it's own.
and cut holes in the bottom. 
You do however need to make sure that they go up the sides a bit, 
if they are all on the bottom they won't get proper drainage and you'll get root rot. But that's it, nice and easy and inexpensive.
Now it's ready to be used.
She's about 9" tall and 16" across the long way. 
My sister in law gave her to me, she had her at work but she just didn't have the environment to let it thrive. That happens sometimes, in offices particularly. She looks like a savanna tree because of the way she's been pruned, it's pretty cool.
They look like frog legs.
I've taken about eight cuttings from her, all of them were rooting in water as I mentioned in my first post about propagation. Except for one that met with a falling mishap all have been doing fine. At least so far as the people who have them tell me. Heh. The ones I have are growing quite well. 
One is ~14" high and one of the cups has two cuttings one of them ~10" and the other growing off at all kinds of weird angles. I'll do a post about them some other time. But, here is proof that propagating ficuses in water works. Well, internet proof anyway.
Alright, kids, this is going to be a constantly updated post. I'm going to be putting not only what I know in here (or suspect at least, heh), but also any reader tips I get. Eventually I'm going to go through my books and bookmarked websites and put some actual numbers up here, but for now I'm just going to run down the basics. If you have any tips you want to share just leave them in the comment section and I will add them, with attribution of course.
This, my friends, is the first step towards propagating a tree in water. Not too far fetched, I know. Heh. I am going to blog it's progress over the next several months. First though, I'm going to give a quick overview of how I do this whole thing.
Heh, plant photography is a bit different than food photography. I've had the best luck with branches that have 4-5 leaves, around 5-6" long. I cut off most of the leaves, leaving the two at the top. Then you just put it cut side down into a cup full of water and put it in bright indirect light. And wait. There's a lot of waiting. But within a couple weeks you'll see little white roots. I'm keeping it in front of a south facing window, next to it's mother. 
They get some late afternoon direct sunlight, but not too much. Ficus benjamina don't want too much direct sun, but some isn't bad. If the leaves start looking bleached the tree is getting too much.
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