I'll third www.rabbit.org
. They are TONS OF WORK though. I loved my rabbits and I miss them, but I will not have rabbits again. We gave them veggies, pellets and hay. The hay especially can get pretty messy and they need a lot of it all the time. They can be litter boxed trained, but you can't use regular cat litter because they will eat it and it is terribly bad for them, so you have to change the whole litter, and not just scoop stuff like with cats. What ended up working for us was a layered system - a litter box with a separate rim (so they won't chew the plastic liner), a plastic liner, some folded newspapers for absorbency, some "yesterday's news" litter for absorbency and smell (this is expensive, but made a big difference on smell), some shredded paper for bulk, and finally some "carefresh" litter on top.
Also, rabbit proofing can be really hard. I put wire covers on all the wires and they managed to eat through them like it was nothing! For chewing, rabbit toys were too small, so I got some bird toys that worked well. They need a lot of space. We ended up using a dog exercise play pen - I started with a plastic baby exercise play yard thingy, but they ate that. The metal dog one worked better - I had two attached to each other. I also had to make some flooring because play pens don't come with a floor.
Finally, the vet bills can be pretty expensive, because they are considered exotics, so it costs more than taking a dog or cat to the vet.
There's a lot of good stuff too, but I'm glad you are researching it to know what you are getting into. I researched it a bunch too and still made the decision to get them - but I think they were even more work than I expected. I had them about 8 years (I got them a little bit under 1 year old, I think).