I know we've discussed this in the past, but I just took another look at it and was blown away. Between what comes in the main package and what you can add after the fact, I have everything I need in a portable format. Even OpenOffice is represented. All of the apps run as fast off my SD card as they would off the hard drive too. I even added Putty on my own and got it to appear in the menu (hint: create a PuttyPortable directory and drop the putty.exe file into it).
Web browser, email clients, disk utilities (zip, shred, antivirus, CD/DVD burner, etc), Office apps, games, chat clients, etc and so on.
Chris