The official Dim Shore FAQ (via, the late Juan non Volokh)
Q: Hmm; Dim Shore. What kind of name is that?
A: A pseudonym.
Q: That sounds fishy — what does he have to hide?
A: His name.
Q: Oh, pretty please, we’re soooo curious — tell us who he is.
Q: Ah, I’ve got it figured out: This is actually your own pseudonym, so you can post things that you’d be ashamed to see under your name.
A: I have no shame. More importantly, if it’s good enough for Publius, Lewis Carroll, Mark Twain, Vladimir Lenin, and Josef Stalin — wait a sec, strike those last two — it’s good enough for me.