Jake bible does that to. He's pretty good at it, I listen to some o his stuff also.

Mark Yoshimoto Nemcoff does a pretty good job with voices, but also has at least one audiobook with "guest voices".  Not quite an audio drama, but still very engaging.

Mike Bennett does voices too, some better than others, but he is very fun to listen to in general.

... don't forget two of the biggies - Seth Harwood and J.C. Hutchins

Dude if you want to hear a really good story, listen to we're alive. It's watching tv without the picture and only the sound. Thierry third season starts on Jan second, but you can the rest on iTunes. It is the ultimate in zombie audiodramas.

nate lowell

have you heard Tekdiff  http://www.cayenne.libsyn.com/  and Bell's in the Batfry http://thebatfry.com/ but the are audio drama but Tekdiff's The Account stories should be on podiobooks