We've been looking for a way to store our growing print collection. We have more than we can hang on the walls, but we'd like to keep collecting. We stole this idea from Martha Stewart Kids. Roll up prints and store them in labeled mailing tubes inside a cylindrical trash can (like this one from Umbra). Cardboard tubes aren't archival, so if you need to store something long-term, spring for archival tubes. These aren't too pricey at $4.50 each.
Related Links: Good Questions: Suggestions for Inexpensive Framing Stores?
How To: Start an Art Collection
Problem Solver: Poster Hanger