If you need to get a better understand of Metasploit or want something visual to reference against Offensive Security's excellent Metasploit Unleashed guide
http://www.offensive-security.com/metasploit-unleashed/Adrian Crenshaw (irongeek) has posted up videos that he organized with a group of very smart folks to teach. The videos are here:
http://www.irongeek.com/i.php?page=videos/metasploit-classBe warned - there's a day in front of the computer if you're going to watch all the videos!
Still, there are some great little tips in there for those with even good experience of Metasploit.
Proceeds from the class went to the Hackers For Charity Food for Work program, so if you watch the material, think about dropping a few coins over to
http://www.hackersforcharity.org/food-program/