Thartley!! I'm saddened. I could have told you that!
Now, to kind of bring to light some problems here. I don't like portable apps. They have a good idea, but it doesn't work as well as it could. Also, for PortableApps to start up when you put your usb drive in your computer, you do have to load a file onto your computer. This isn't really a problem, but there are 2 things. 1) You loose your privacy by leaving a foot print on any computer you use. 2) You'll find that the programs that you wanted to start-on-load don't because they are missing that file.
Now. If you absolutely love the idea of PortableApps, that's great. i would advise you get a U3 USB drive, since they also allow you to use an antivirus.
If you don't love the idea of a PortableApps or any other program that limits the abilities of your USB drive, check out the sites below.
PenDriveApps The Portable Freeware CollectionEverything USB (I don't suggest these only because they cost money, but if you don't mind the price they could be good)
Make Use Of...osxportableapps(for Macs only)
You'll notice a lot of the sites have the same things. There aren't as many portable programs out there as there are regular programs. That being said, any program that doesn't need to be installed, merely run, can be used on an USB drive.
Also, for Thartley, you can set up an USB drive to be a sort of emergency drive for your computer. Depending upon the size (+1GB is preferable) you can load an entire operating system on it, sucessfully allowing you to take you "computer" anywhere.
Windows XP
ngineTech RepublicMac
Old MacNew Mac (OS X)
Mac GeekBrad BergeronLinux (linux is easy!)
SoylinkLinux USBIn all honest there are so many Linux on usb guides that it would be frivolous to attempt to put them all on here.
Anyway hope that helps open your eyes to the true abilities of USB thumb/pen/jump-drive.
There are some cautions. These drives will NEVER (in this incarnation) last as long as your hard drive. Make sure you make back ups. The more you use them the more likely they'll fail. Not necessarily in like 5 times, but a million reads adds up quickly. Just for your sakes, back up all of your important data. if nothing else, create an image on a cd or dvd of your jumpdrive so you can restore it to a new one when yours dies. Just to be safe.
Enjoy!
Hunter.