Yes, Sajak is one of the best. I somehow didn't catch the Maja Playa one the first time through...that's hilarious.
I have to mention PBR's uncommonly tame "Goodbye, host" during the Paul F. Tompkins call and "Host, I don't like you" from the Zach Galifianakis fan. For some reason, those killed me.
One of my favorite death threats, I can never remember verbatim. I wish I could, because I've been wanting to hear it again. I can't remember the character either, but he just tells an associate of some foreign name to get a weapon, saying something like "Yari, get the razor..." and then hangs up. That was one of the biggest laughs, for me. If anyone can, please tell me which show this was from.