PortableApps.com - Portable software for USB drives Check out this great suite of programs. They have taken some popular Open Source programs and converted them into portable form. meaning they can be installed on a flash drive and used on any PC. "PortableApps.com Suite is a complete collection of portable apps including a web browser, email client, office suite, calendar/scheduler, instant messaging client, antivirus, audio player, sudoku game, password manager, PDF reader, minesweeper clone, backup utility and integrated menu, all preconfigured to work portably. Just drop it on your portable device and you're ready to go."