I've found myself looking for the search button in paper books a few times... Paper is much easier to handle, but is so restrictive sometimes.

Re: NASA MMO. Orbiter (http://www.orbitersim.com/) is a free space simulator that has a fan-made multiplayer component. It's not the best yet (the online bit, the program itself is awesome), and it's extremely customisable if you're good with a 3d program, and can learn some basic codery.