AudioFinder - like a database for your audio files <3 - link
Snapper - audio preview and selection extraction for finder - link
Path Finder - A bit more powerful file browser ie: a finder replacement - link
Adium - AIM / google talk / yahoo im / etc (like gaim on xp only better) - link
Parallels - XP & Linux on OSX (good for running xp apps you still need) - link
Textmate - Another Text / Coding editor - link
