When I read about other distros I feel like kid in a candy store.
Here are some of the ones interesting to me!
Debian -> Huge repositories; Stringent quality control with Stable releases.
Cruncbang -> Simplicity, reconfigurability and I like the black.
Arch Linux -> Rolling Release, Great documentation; Arch User Repository, if you don't worry about security issues!
SimplyMepis -> Packaged cutting edge features of Debian.
Linux Mint -> Rolling release based on Debian testing.
What do you like and why?