I use ext3 exclusively here, mostly for the reduced hassle: all distros and boot CDs support it "out of the box".

But it sucks for performance compared with XFS / JFS.

ReiserFS is actually two different file systems right now: Reiser3 and Reiser4. The latter is too new to be stable, and the former is inferior to XFS/JFS, but existed in Linux before any of its rivals.

Cheers