Best filesystem for an external/portable harddrive?

[tristan]

I set up my external USB 40Gb hard drive with Fat32 (using gparted).
Sure it's not terribly fast but I can guarantee that it'll work on any
other computer if needs be. I only use the drive once or twice a week
as a backup, so the performance issues are not important.



If I had no intention of ever connecting it to a non linux box then I'd
probably use reiserfs.


-- 
tristan