To keep care of your collection: Invest some money in a shelf that doesn't collapse as soon as you walk out of your room (
Link) *scnr* *g* (@Boyblunder: I hope you forgive me!!
)
I currently have some simple CD shelfs from IKEA, three ones to be precise. Since a single one is really unstable and I didn't have the nerve to drill holes in my walls I decided to put the three together and connected them at the top with a strip of wood. This way the whole thing is very stable.
Pic here (crappy webcam shot):
Link
The two BILLY shelfs surrounding the construction give additional stability.