There's an interesting list of 75 Things You Can Compost, But Thought You Couldn't at:

http://planetgreen.discovery.com/home-garden/surprising-compost-ite...

While every item is not for everyone, the list is meant to get you thinking about your compost possibilities. Imagine how much trash we could prevent from going into the landfills if each of us just decided to compost a few more things.

PlanetGreen is also a great reference site for all things Green.