The Tom Mabe stuff is REALLY good, I've got all his albums. I'm a prank call fanatic actually, I have a pretty serious collection of prank call CD's. They provide a great ear break when I just need a rest from music.
If you're into prank calls you MUST check out the Touchtone Terrorist/Junkyard Willie albums:
http://www.junkyardwillie.comThese are hands down the funniest calls I've ever heard. Customer Service Crackpots and Customer Service Disasters are the best of the four (a MUST have if you enjoy this sort of thing), although the others are pretty good too.
This guy basically registers a phone number that's one digit off from the customer service department of a legitimate business, and then proceeds to provide the WORST customer service ever. HYSTERICAL. I give these a listen every few months or so and they STILL kill me.
-Lance