Just for reference, a question about where to go for tutorials on Metasploit was recently posted to the pen-test mailing list on SecurityFocus. Here are some of the responses. At some point I need to explore this silc channel…

Metasploit (wiki)Book
Offensive Security 101
Metasploit Toolkit (Syngress)
milw0rm videos
IronGeek video
Tyler’s videos