0 LEGO NXT wire pinout

This was a very helpful graphic I found a while back. It shows which pins do what on the LEGO NXT cable connections.

I also received a suggestion recommending this site: http://www.philohome.com/nxt.htm which has a lot of good information regarding NXT projects for users that want to take their NXT designs to a more advanced level. This site has good instructions and I would definitely recommend checking it out.