BTW, I noticed that the site was selling subscription services. Megans law means that there is a FREE national database.
http://www.google.com/search?hl=en&q=megan+law&btnG=Google+Search
I don't really see the point of a site like that though, regardless of how many assholes and perverts out there in the world. Everyone should be teaching their families to be cautious, alert, and safe. In California the police do not have any requirement to keep you safe, regardless of what most people think.
It seems to me that this is just a way for the courts to let people think they are doing something about child molesters, instead of actually doing something with sentencing and rehabilitation. I can't recall the numbers, but I remember seeing that something on the order of 80% of offenders offend again.