Sally sent in this tip that I thought was interesting. Google has created a mobile site that gives you basic election information for every state. It gives you links to the election hotline for that state along with the deadline for registering. Also they link to the states informational pages for the elections. You just enter in your 2 letter state code for information.
Check it out at m.google.com/elections and let us know if you found a better resource. Nothing groundbreaking but mobile election resources are useful in my opinion.