I've been a fan of ReiserFS for a while, as it just seems to work so much better then ext2/3 in situations where a lot of files might be in the same directory. For me this comes in handy with maildir mailboxes across the system, but might also be handy on a media system. I also trust the recovery tools to get things back if something goes horribly wrong, having once rebuilt a filesystem after a raid 5 meltdown of 1 failed drive and a second with a few bad areas. Once I forced the raid back online, reiserfs tools quickly got back everything possible.