One little thing about me is that I like to download all my portable apps as the zip files. I have some other portable apps as well, such as DeepBurner portable, that is already made (portable apps are the best thing to happen EVER). The thing is, I get stuck when I need to install an unzipper, and the only good unzippers I know of are winrar and 7zip, but both are installers. I think that a portable self-extracting 7zip program should be developed as well.
Some other open-source programs that don't have portable files being developed by the developer yet are:
Eraser
Azureus
StepMania
Also, PStart is a GREAAAAT program for any portable apps, and some other useful programs already come with zipped and portable alternative downloads such as:
DeepBurner
NotePad++
MediaPlayerClassic
and others that I can't think of right now
One more thing that I'd like to add, I'd like to say an AWESOME idea has been created by this site, and that because of you, programs are becoming more portable and less reliant on the windows registry and external storage files, and that has made computing MUCH MUCH better. Kudos to you.