A few months ago, I uploaded this to  portzebie, but I figured I would crosspost it here as well.
Here's twenty-four of my best impressions, and yes, I am well aware that they aren't perfect. Enjoy or don't! I'll be recording a second one very soon of 24 more voices. :)

IN ORDER OF APPEARANCE:
The CryptKeeper, Bob Hoskins, Barney Rubble, Zapp Brannigan, Skeletor, Yogi Bear, Boo-Boo, Pat Buttram, Swedish Chef, Popeye, Coach Z, Don Knotts, Crazy Taxi Announcer, Homsar, McGruff, Barney the Dinosaur, Ahnold, Krusty the Clown, Elmo, Kermit, Patrick, Spongebob, Mickey Mouse, Pee-Wee Herman, Dr. Claw, Marvin the Martian