Ophcrack LiveCD & Others

LiveCD's are great. No need to install anything and you can find a liveCD for every purpose. If you just need a temporary linux desktop, use the vanilla Knoppix or the Ubuntu livecd. Do you need forensics tools: download Helix.
Do you need to do a pentest? Get Backtrack. A lot of tools will be common on several of these CD's. Do you need a password recovery and auditing tool like ophcrack? Try the Ophcrack LiveCD.

With ophcrack and Rainbowtables, you can find passwords in a matter of minutes. So protect your SAM and use a good password policy.