I'd like to experiment with mounting my Canon F/1.4 50 mm lens backwards to experiment with macro photography (on a Rebel Xti).
What kind of gear do I need, and how do I go about it?
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You may want a coupling ring ($7). This lets you mount one lens, in reverse, to another lens. This gives you insane macro capabilities, and very little depth of field.
You will find that focusing takes an extremely long time, and you need to set your aperture on your reversed lens first, mounted normally, before flipping it. Not-too-good-example
You will need a Reverse Mount Adapter, here's an example. You mount the adapter to the body, then mount the lens and finally you attach the second part of the adapter to the back of your lens.