I really like the way Florida has been doing it with the paper. I just wouldn't trust a strictly data-driven system. Data can easily go *poof* during a malfunction and it's gone forever. I also feel it can be easily manipulated if hacked. It's much harder to manipulate hard paper with the oversight they have set up. I think their check-in procedures are pretty spot on as well. You have to be on their list of registered voters and show ID. I'm sure there are still bad players who can abuse the system this way, but it is much more difficult than simply jumping on a bus and riding from polling station to polling station.
I'm still a little lost on the ID requirement. You are either a registered voter on the list or you aren't. If you aren't on the list, you can't vote. If you are on the list and already voted, you can't vote. Only if you are on the list in your precinct and have not registered a vote can you vote again. It would be really difficult to leverage that to your advantage on any significant scale.
