First of all, I want to thank everyone who contributes to this 'project', including the original software developpers. I found out about portableapps.com yesterday and I'm already hooked!
Well, I have a few suggestions, for apps that would be awesome if they were portable:
-Media Player Classic ( http://sourceforge.net/projects/guliverkli/ )
-VirtualDub ( http://www.virtualdub.org )
-µTorrent (not open source, but free, and damn it's light! http://www.utorrent.com )
-7-zip ( http://www.7-zip.org )
-CDex ( http://sourceforge.net/projects/cdexos )
-ClamWin ( http://www.clamwin.com/ )
-Spybot (freeware, but not open source... http://www.safer-networking.org/ )
And maybe those?
Some of these might already be portable, but I'm no expert, so I can't really tell. You guys are the pros Thank you!