Inside Electronic Voting Machines
Alien54 and several other people wrote in about a couple of stories published in a New Zealand webzine: an examination of an electronic voting system, and some less interesting political speculation about it. Diebold voting systems are in fairly wide use, and apparently provide zero security to keep election officials from writing in whatever election totals they want.
Three years later, and it seems that equipment manufacturers have managed to blithely ignore every bit of it. And apparently, so have the people purchasing the stuff.
As bad as ATM security might be, they're still better than voting machines in one way. There's a paper trail. They print a paper receipt for the user and print an internal receipt for its own records. IMHO a paper trail is even more important than open source or code review.