Stuff I've stopped using but you might find it useful:
- SnapNDrag easy screen captures
- xv Image viewer
- Skype
- Fink Open source software package manager
- Firefox the best web browser (see my blog about my favorite extensions)
- Quicksilver better than spotlight, faster easier to use, and has advanced features I've not even got into using yet
- Adium multi protocol IM client Used to crash a lot, works great now
- Emacs native version doesn't need to run in a terminal
- ssh-keychain Keep SSH keys in your Apple Keychain
- Salling clicker do amazing things on your mac via your bluetooth phone
- Synergy Share keyboard and mouse accross platforms
- iPhoto to gallery
- iScroll2 tell your mac to scroll with two fingers