Too much information?

So I'm browsing the news on the local newspaper's web site and see a link to the Portland Police Dept. interactive crime mapping feature. Interesting 2.0 application. Would like to see what is going on in my neighborhood.

I stumble upon a map that shows me where all the sex offenders live - photos, addresses, specific crime and date. Wow. Creepy. Very detailed. Is this going to make me safer or more paranoid? How up to date is this info (this is the librarian in me)? Does every city offer this service? What do I do if I see one of these guys?