Liëka and I just fount out that both of us are obsessed of these books. They're frikkin' awesome!
They're written by the amazing Douglas Adams and there are five books of this series:

1. The Hitchhiker’s Guide to the Galaxy
2. The Restaurant at the End of the Universe
3. Life, the Universe, and Everything
4. So Long and Thanks for All the Fish
5. Mostly Harmless

There are also many movies, radio plays & artworks for fans. =D
Need any more descriptions? No? Then let's talk about these books. ;D

Ah! Maybe we ought to shuftie our conversation over here then. xD