Chart from the CDC - 1955-2001. Skunks may have overtaken raccoons in the 5 years since they compiled the statistics, but bats aren't even close.


(I'm personally not too sure of these figures - where they got them or how they calculated them.)
Raccoon bite - 44% of USA rabies cases
Skunk bite - 28.5% of USA rabies cases
Bat bite - 12.5% of USA rabies cases
Fox bite - 5.5% of USA rabies cases

From http://www.wrongdiagnosis.com

Batty's basement buddy probably isn't rabid, but since the disease is fatal and the shots are a real inconvenience, best to be careful.