THere's a ton ofthreads on this.. some pretty recent.. Try the search function using verigication or P411 or datecheck, RS2000, etc..  
http://www.theeroticreview.com/discussion_boards/viewmsg.asp?MessageID=127722&boardID=33&page=#127722

http://www.theeroticreview.com/discussion_boards/viewmsg.asp?MessageID=127352&boardID=33&page=#127352

http://www.theeroticreview.com/discussion_boards/viewmsg.asp?BoardID=33&SortBy=DateCreated%20desc&Search=P411&SearchType=1&DayFrom=30&DayTo=0&MessageID=127812&frmSearch=1#127812

THat's just a start

Julia's blog this evening has some scary info on P411.

I'm a part time hobbyist and I'm right there with you.  I don't trust giving that info to any of these services, especially since I see many providers don't rely on the services to begin with.  Most do some sort of their own verification so you are going to have to make them comfortable.  It just seems like and extra level of risk.  Your personal information is sitting on a server in some company somewhere that can be accessed via the Internet or the data can be obtained via a warrant......sorry, I'll pass.

Date Check is the only one I signed up for, because they didn't ask for any personal info from me.  They only required providers to vouch for me, which I politely asked them to do, and they did.  Plus I paid Date Check once for a lifetime membership. So I never need to be bothered with that again.  

I don't care if the owner of P411 says they need my info and then they will destroy it.  Obviously they would tell you what you want to hear anyway, regardless of whether or not it is true.  I am not saying it is not true, that part I don't know for sure.  In truth, nobody knows for sure.