If you've found this group, you probably already know how awesome LCS is, so I'll spare you the description. There's a couple useful links you should know about if you're new though. The chatroom is also a great way to learn, assuming the people in there are willing to help!

FP Thread[www.facepunch.com]
LCS Wiki[lcs.wikidot.com]
Latest Version[www.jonathansfox.com]