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First it was To Catch A Predator. Now, New York Democrat Charles E. Schumer and Arizona Republican John McCain say they planned to introduce a bill at the beginning of the 110th Congress in January that would require registered sex offenders to submit their active email addresses to law enforcement.

Last week, MySpace said it would offer in the next 30 days a technology to identify and block convicted sex offenders from the popular online social network. Myspace struck a deal with Sentinel Tech Holding Corp., to build the new feature.

There are 550,000 registered sex offenders in the United States, tracked from 46 state sex offender registries. What about the other four states?