Thanks for all the kind words. Your guys' advice helped me to make Oreo's last few days here that much more comfortable. It's sad that she died, but she was a 9 year old small breed with cancer. It's probably better that she died like this, without a lot of pain (she never ground her teeth loudy) than if she lived longer and had the cancer spread.
Thanks again for everything you guy's have said and helped me do. For now, I need to finish uber-bleach/scrub/scrape the stains off bunny's cage, and do some research around town to find the healthiest pellets, the nicest hay, and some grass mats and stuff.
The way I see it, I already know what bunnies (in general) need in regards to food ratios and stuff, so I owe it to the bunny population to adopt a few bunnies and save them from being 'gift' bunnies to small children with ignorant parents, or worse, food. Some one just up the street sevral blocks raises bunnies for food! D: