Well I know a friend told me that a week before the election, some documents were leaked to the BBC about planned GOP operative activity.
From what I understand, the document included the plan to have operatives set up road blocks in black neighborhoods during voting day, for obvious reasons.
Secondly, there is a report of a woman in Florida who had to try to get the machine to register her vote for Kerry as Kerry instead of Bush ten times, before finally calling a technical assistant.