Have you got a fever? And the only prescription...
...is more cowbell?
Rad Monkey Cowbells has the cure for what ails you. Not only do they offer the first ever electric cowbell, but they've got a preview up for the VLC800, which uses digital modeling to emulate 12 classic cowbell sounds. If only Gene Frenkle had lived to see this day.
(Yes, it is a joke. The same people created the Sonicfinger plugins, including "Virtual Studio Visitor" and the "Dead Quietenator.")