knoppix

Take your Favorite Portable Linux Desktop with you wherever you go Popular YUMI – Your Universal Multiboot InstallerPopular Universal USB Installer – Easy as 1 2 3 Easily install your favorite Linux operating system on a flash drive or USB key no larger than your thumb (Thumb Drive). Your Portable Linux operating system can then be taken with you, and run from any computer that can boot from the USB flash device. Boot and run Linux from a USB flash memory stick | Pen Drive Linux

Boot and run Linux from a USB flash memory stick | Pen Drive Linux

Portable applications that run from a USB device | PenDriveApps.com

Portable applications that run from a USB device | PenDriveApps.com Free Portable Software to Carry with you on a USB Flash Drive Independently reviewed and categorized Free Portable Software, Portable Freeware, and Open Source Portable Applications that can be stored and run directly from a USB Flash Drive, without the need to install the software to a PC. Bring your office applications, email, web browser, instant messaging software, games, graphical editors, media player, anti virus software, recovery tools, encryption utilities, P2P file sharing utilities and more with you. Most, but not all of these freeware and open source third party portable apps were created by their respective authors with the ability to be run entirely from the portable device, and in many cases these portable tools allow you to save your personal settings, changes, and work created with the tools back to the same device. Recently Reviewed Portable Software Applications
Hack Attack: Quicklaunch your USB workspace - Lifehacker