Collection of how-to's
#1
hashcat:

http://www.question-defense.com/2010/08/...e-mismatch
http://www.question-defense.com/2010/08/...ure-hashes
http://www.question-defense.com/2010/08/...md5-hashes

oclHashcat:

http://www.question-defense.com/2010/06/...ng-open-cl
http://www.question-defense.com/2010/08/...int-attack
#2
Also check out this site: http://ob-security.info