Yup, as rabbit mage says, Ive been doing this for a long time. My rabbits are fed pellets and hay. Some of mine have went on to place very well, and even had one win at nationals. You don't get that with unhealthy rabbits. The information I use caomes from rabbit breeders, and those heavily involved in the hobby that out a lot effort and research into it. Even most pet owners feed their rabbits mostly a commercial pellet. I had one bunny that was given to me years ago that was fed mostly vegetables (HRS diet). He was sickly, and out of condition. It took me three weeks to break him off the vegetables to get him to eat pellets. Ive also heard plenty of horror stories where someone followed the HRS guidelines/fed them greens and vegetables, and it killed their rabbit. Fact is there was one that I know of that was more recent. And I believe this person got her information off the internet. The only thing she ended up with was a dead bunny.
Like rabbitmage also says, you can feed it. But it takes a lot of extensive knowledge to make sure that rabbit is getting the right amount of nutrition so that it stays healthy, and in good flesh condition. Your average pet owner (or beginner) is not going to know that. Besides that out of the 'healthy rabbits' I have seen that have been fed the veggie based diet, I have yet to see one that actually is in good health. Most of these rabbitsd are also prone to dental disease, and GI stasis (so much for good health huh?). Whereas breeders and pets fed on pellets don't seem to have that problem. And yes we do pay very close attanetion to the health and well being of our rabbits. (In case that does get brought up). In all the years Ive been raising rabbits I have never once had a case of dental disease. And have only had a couple of them get GI stasis. And I have raised hundreds of rabbits. Some of that have died at an old age. Currently my oldest ones are about six years old, and still going strong.
Thats why its best to feed pellets first, then hay, and everything else as treats.
This site has a pretty good rabbit forum so far.
I would also suggest joining ones like the showbunnylist.
http://pets.groups.yahoo.com/group/ShowBunnyList/
And even meat rabbits is a good one in case you ever decide to breed and raise them for food.
http://groups.yahoo.com/group/Meatrabbits
There is also the ingoing debate on whether the rabbits can pick up lice and mites from the chickens too. I don't think its possible because I have mine in the same building with my pigeons and I don't have a problem with it.