Okay, I've gotten my first spam (or at least what I consider spam) since installing MT-Blacklist. This spam is a bit odd, because the name ("addy"), e-mail ("add" at "mail.com"), and URL (domain "uuo.com") are all bogus. The comment ("Hello<> friends") is pretty typical of the comment span I've been receiving.
I've deleted the comment, but should I do anything further, like add the (bogus) domain to MT-Blacklist's blacklist file, or report it to the MT-Blacklist Clearinghouse? I'm really not sure at this point. I read somewhere on the Blacklist Clearinghouse comments where someone thought a spammer was testing their blog (perhaps to see what it would accept?) - I wonder if that's what's going on here.