I saw flyers in the library for P2Pspot.com.  It's actually pretty cool, It allows WMU students to exchange textbooks on campus and its totally free.  I played around with it for a little bit and I was able to add KCC to my P2Pspot.com network.

I just listed my books on P2Pspot (aka P2Ptextbooks) and noticed that there are a ton of GVSU people on there.  Its looks pretty sweet, it allows you to connect with other students to exchange on-campus.  You receive an e-mail when someone buys your book and I even set it up to send a text message too.  Have any of you heard of this?