The following article details some of the hazards of electronic voting. It's somewhat long, but it's very interesting (and a bit frightening):
How to steal an election by hacking the vote
I especially like the default password of '1111' on the voting machines, and the fact that this is probably still the password on a large number of these machines. And the fact that the same key (the same little chunk of metal) will access the memory card on every single machine.