Hey Gog, for about the fifth time you have ignored this -- care to comment finally?
Sorry, lots of posts, little time.
Regarding the notary, it might help a bit. However you do realize that the powers of a notary aren't the same in all states? In some states, notaries can't verify documents, they can only be an impartial witness to oaths. Also, the standards of getting authorized as a notary are pathetic. These aren't crack legal scholars, waiting to verify your identities and documents. If you get a fake ID that can get you past a bouncer, you can fool a notary.
http://www.schneier.com/blog/archives/2006/11/notary_fraud.htmlRequiring a notary is false security. Notary fraud is commonplace.
It is also an expense for Prosper to handle yet ANOTHER piece of paperwork to process a simple loan. Notarization only matters if Prosper checks with the Notary for every one. Otherwise, it is worthless as a pre-loan verification. The only thing requiring a notarization gets you, is another person to sue if things go belly up.
I don't think requiring notarization will contribute enough to the safety of the process to compensate for the extra burdens it places on honest Borrowers, and the additional cost to Prosper. Cheap and effective is what you need, Notarization is neither.