A few links of tools I find quite useful. Burning new copies for the CD case I carry around.

http://www.ubuntu.com/download
http://www.piotrbania.com/all/kon-boot/
http://www.backtrack-linux.org/
http://www.ultimatebootcd.com/
http://clonezilla.org/clonezilla-live.php

Autoruns (http://technet.microsoft.com/en-us/sysinternals/bb963902)
Process Explorer (http://technet.microsoft.com/en-us/sysinternals/bb896653)
Process Monitor (http://technet.microsoft.com/en-us/sysinternals/bb896645)
TCPView (http://technet.microsoft.com/en-us/sysinternals/bb897437)

http://portableapps.com/apps/utilities/windirstat_portable
http://portableapps.com/apps/utilities/winmerge_portable
http://portableapps.com/apps/utilities/7-zip_portable
http://portableapps.com/apps/utilities/clamwin_portable