RIP, RIPLinux or 'Recovery Is Possible!'
My favorite live Linux, based on Slackware, can run from a USB drive.
The author is Kent Robotti.
Home page
http://www.tux.org/pub/people/kent-robotti/looplinux/rip/
Mirror
http://rip.7bf.de/current/
Version numbers
9.5 18 Jun 2004 2.6.7
2.9 5-17-2007 2.6.21
11.3 13-Jan-2011
13.5 Jun 24, 2011
http://rip.7bf.de/all_mirrored_versions/listing.html