PortableApps?
It's a GREAT set of applications designed to run directly off of a thumb drive. I have been using them for quite some time. I put them on an 8 Gig SD card (would fit on a much smaller card if needed) that I use in my original 7 inch Eee PC. I also put a copy of them on a normal thumb drive that I use when we go to an Internet Cafe when we visit a town and I don't want to take my Eee. By using the portableApps, when I log off of the rental PC, I remove the thumb drive and NOTHING remains on the rental PC, not even a record I was there. It also let's be take my bookmarks with me to any PC I might use.
You can see the PortableApps at their site at: http://portableapps.com/
AND, they never need an install to run on any computer.
Greg