The Problem with Electronic Voting Machines
In the aftermath of the U.S.’s 2004 election, electronic voting machines are again in the news. Computerized machines lost votes, subtracted votes instead of adding them, and doubled votes. Because many of these machines have no paper audit trails, a large number of votes will never be counted. And while it is unlikely that deliberate voting-machine fraud changed the result of the presidential election, the Internet is buzzing with rumors and allegations of fraud in a number of different jurisdictions and races. It is still to early to tell if any of these problems affected any individual elections, over the next several weeks we'll see whether any of the information crystallizes into something significant.
Read the article here: http://www.schneier.com/blog/archives/2004/11/the_problem_wit.html
Or read it here, with inline links: http://www.opendemocracy.com/debates/article-8-120-2213.jsp
Interestingly, each is slightly different from the other. The second specifically refers to names and events and links to them, so if you like that sort of thing, go there. Each has essentially the same content (and even if you read the first, you can always pull up the second just to follow its links), and I highly recommend reading at least one of them.