I have 3 of the cute lil buggers, they can live anywhere up to 10 years or even more sometimes if kept indoors, spayed/neutered, etc. Female rabbits are very prone to ovarian cancer, and never live as long if they're not spayed. And as said above, it helps with behavior too! To a point.
This site is my bunny bible: http://www.rabbit.org/
It covers everything about bunny care that I can possibly think of! Gotta find a bunny savvy vet though, because they're very sensitive and need special care. Some meds that are good for other animals will kill them, so it's important to do research and find somebody who's experienced with rabbits.
I love my guys, so much personality! They're sneaky mischevious little stinkers, but adorable and SO entertaining.They're our most high maintenance pets over here (well, they were before the cat started having health dramas) but really rewarding and worth the work. I can't imagine having a home without a few bunnies in it anymore than I can imagine not having snakes around these days!