Hey all!
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:
Multimedia:
-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 )
Games:
-Zsnes ( http://sourceforge.net/projects/zsnes )
-Nestopia ( http://sourceforge.net/projects/nestopia )
-Doukutsu Monogatari / Cave Story ( http://www.gameflaws.com/cavestory/ )
Utility:
-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?
-Audio player
-Image viewer
-CD/DVD burner
-DVD ripper
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!
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uTorrent is portable (last time I looked at it), as are 7-zip and SpyBot. JH is working on a portable ClamWin.
One popular image viewer is IrfanView -- you might try it. Audio player... you could use Winamp.
Check http://www.portablefreeware.com/ for information about many of these -- the directory there is pretty good.
~nm35 {blog} {personal space}