In a similar thread in this section I've presented a way to get Bitcoins and paying by Paypal. In order to prevent fraud, a PIN code (free) is sent to the customer's mobile phone. It could be interesting for newbies and people needing immediate bitcoins at a premium.
The thread is at
https://bitcointalk.org/index.php?topic=38873.0 and so far customers are satisfied

How can you be sure that the phone number is accurate? Paypal doesn't give you they phone number nor ebay.