Image by Ken Hawkins/TheDigitelImage by music.gif
The Charleston City Paper is home to the Charleston Music Directory, a comprehensive guide to local bands and musicians.
This is the first I've seen of the online resource, and it seems pretty solid and complete.
Also note they're looking to update it.
Personally I'd like something like this much more if it were an open resource, but they've done a seemingly good job of making it comprehensive and free-to-access. If there's something better out there, please enlighten me. Perhaps this is just more evidence that the Charleston Wiki needs to be reignited.