Tons of USB friendly applications.
A portable app is a computer program that you can carry around with you on a portable device and use on any Windows computer. When your USB flash drive, portable hard drive, iPod or other portable device is plugged in, you have access to your software and personal data just as you would on your own PC. And when you unplug, none of your personal data is left behind.
Portable Apps Suite Contains: Portable Firefox (web browser), Portable Thunderbird (email client), Portable OpenOffice.org (office suite), Portable AbiWord (word processor), Portable NVU (web editor), Portable Sunbird (calendar & task list), Portable FileZilla (FTP client), Portable Gaim (instant messenger) and will fit on a 256Mb USB thumbdrive (though it is far more comfortable on a 512MB drive).