From just following hyperlinks it seems I've read a little less than half of the Meta-ethics Sequence already, but I haven't read every article (and I admit I've skimmed some of the longer ones). I guess this is a good time as any to go back and read the whole thing.
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous thread is at close to 500 comments.