On the advice of dear Miss Snark, whose opinion I greatly respect, I've decided to take down the very, very angry post I had about the troll. Thank you everyone for your support--it means a lot that people I don't even know in person want to defend me online--that's the internet for you. =)
So what happens now, you ask?
Pretty much, I'm going to ignore any future troll posts. I'm sorry that he/she is cyber-stalking people's blogs, which is what made me so angry in the first place... it's one thing to attack me, but it's a completely different thing to attack my clients and blog readers.
Although I won't have anything to do with this (have to try and take the high road here), if you feel up to it, go have fun figuring out who the troll is. IP logging and other fun tools are readily at your disposal.
(Yes, I'm aware the angry post is still floating around in cached archives--if you're dedicated enough, I'm sure you can find it. It's really not worth your time though. And eventually, it will disappear.)