I actually had to downsize my bookshelves over the past few years. Sold all of my old game systems and games that I had been holding onto -- NES, my two SNES, PS2, and all the games. I've since backed them up digitally to play via emulator.
I made a pretty penny on eBay. I had a few rare RPG items!
I also had to sell most of my player's guides. I did keep the Chrono Cross one, though!
As PS3 and Wii emulation are reaching high reliability, I'll be doing the same for those two systems.