internet (11)
Adium
http://www.adiumx.com/
Use AIM, MSN, Jabber, or Yahoo? Then this awesome multi-protocol Instant Messaging client is for you.
Camino
http://www.caminobrowser.org/
Fast, slick browser, and very functional too. Based on the open source Gecko core, but has the OS X appeal.
Eudora
http://eudora.com
Ugly but still venerable email client. Wickedly fast searches through thousands of messages. And the kicker: total control over leaving/deleting messages on/from the mail server. Lite, sponsored, and premium versions available. Lite and sponsored are freeware.
Firefox
http://www.mozilla.com/firefox/
One of the best browsers on the planet, with hundreds of plugins. You can get an Intel build as well. (wiki.mozilla.org/Mac:Intel)
gDisk
http://gdisk.sourceforge.net/
Amazing little tool lets you use your gmail account (almost 3GB and counting!) as storage space.
Google Earth
http://earth.google.com/
If you don't know what this is yet, you've been under a rock in the middle of Australia. Check out your house with this.
OSXvnc
http://www.redstonesoftware.com/vnc.html
Incredibly useful if you want to access your computer from away from home.UB
SysStat Nano
http://www.islayer.com/viewWidget.php?id=21
This is a Dashboard widget which can show almost every stat about your computer at the click of a button.
Tomato Torrent
http://sarwat.net/bittorrent/
Another BitTorrent Client. This one is very customisable, small and fast.
VLC
http://www.videolan.org/vlc/
The swiss army knife of video players. Can play almost everything except new WMVs. I use this instead of Quicktime Player 99% of the time. Required.