Found this list somewhere online - I can't remember where now - and cleaned it up a little. It's pretty complete. Thought it would be a good idea to post it for all the other rabbit owners out there. If there is something missing please add to the list!
Rabbit Veggie List
Alfalfa, radish & clover sprouts
Basil
Beet greens (tops)*
Bok choy
Broccoli (mostly leaves/stems)*
Brussels sprouts
Carrot & carrot tops*
Celery
Cilantro
Clover
Collard greens*
Dandelion greens & flowers (no pesticides)*
Endive*
Escarole
Green peppers
Kale (!)*
Mint
Mustard greens*
Parsley*
Pea pods (the flat edible kind)*
Peppermint leaves
Raddichio
Radish tops
Raspberry leaves
Romaine lettuce (no iceberg or light colored leaf)*
Spinach (!)*
Watercress*
Wheat grass
Fruit List**
Apple (remove stem and seeds)
Blueberries
Melon
Orange (without the peel)
Papaya
Peach
Pear
Pineapple
Plums
Raspberries
Strawberries
(!)=Use sparingly. High in either oxalates or goitrogens and may be toxic in accumulated quantities over a period of time
Select at least three kinds of vegetables daily. A variety is necessary in order to obtain the necessary nutrients, with one each day that contains Vitamin A, indicated by an *. Add one vegetable to the diet at a time. Eliminate if it causes soft stools or diarrhea.
**Sugary fruits such as bananas and grapes should be used only sparingly, as occasional treats. Bunnies have a sweet tooth and if left to their own devices will devour sugary foods to the exclusion of healthful ones.**

Rabbit Veggie List
Alfalfa, radish & clover sprouts
Basil
Beet greens (tops)*
Bok choy
Broccoli (mostly leaves/stems)*
Brussels sprouts
Carrot & carrot tops*
Celery
Cilantro
Clover
Collard greens*
Dandelion greens & flowers (no pesticides)*
Endive*
Escarole
Green peppers
Kale (!)*
Mint
Mustard greens*
Parsley*
Pea pods (the flat edible kind)*
Peppermint leaves
Raddichio
Radish tops
Raspberry leaves
Romaine lettuce (no iceberg or light colored leaf)*
Spinach (!)*
Watercress*
Wheat grass
Fruit List**
Apple (remove stem and seeds)
Blueberries
Melon
Orange (without the peel)
Papaya
Peach
Pear
Pineapple
Plums
Raspberries
Strawberries
(!)=Use sparingly. High in either oxalates or goitrogens and may be toxic in accumulated quantities over a period of time
Select at least three kinds of vegetables daily. A variety is necessary in order to obtain the necessary nutrients, with one each day that contains Vitamin A, indicated by an *. Add one vegetable to the diet at a time. Eliminate if it causes soft stools or diarrhea.
**Sugary fruits such as bananas and grapes should be used only sparingly, as occasional treats. Bunnies have a sweet tooth and if left to their own devices will devour sugary foods to the exclusion of healthful ones.**