If you want simple, beautiful, compact storage, look no further than the combination of a few pieces of IKEA furniture. The folks over at IKEA Hackers discovered that Linnmon table tops, combined with Expedit storage grid modules, can create a simple rolling library.
You just need to pick up your LINNMON (two of them) and EXPEDIT (three) at IKEA and add a few other elements (casters, wood strips) to put this project together. For the most part you build the furniture as IKEA intended and add a few extra elements. When you're done, you get this awesome little storage module that holds a lot and looks great.
A Library on Wheels [IKEA Hackers]