Avi Rubin, a security researcher that has done a lot of electronic voting analysis, has blogged his experience working as an election worker in a precinct that not only uses electronic voting, but (more horribly, it turns out) uses electronic check-in and verification in an effort to stop voting fraud.
My wife and I are trying to volunteer to work the polls for the next election. Not sure if we will be able to. This will be the first election that we are reuqired to use electronic voting. It's stories like these that make me shudder at the thought of what it could be like.