userdan is correct.
Paypal uses VeriSign Extended Validation (EV) SSL Certificates. Many other banks have deployed these new Certificates because of the Green bars. The Green status bars indicate that visitors are on the site they think they are on, and not some fraudulent Web site attempting to steal their personal information.
EV SSL is a great tool to combat phishing AND gain your visitor's trust.
Here are dozens of Case studies with measured ROI from EV SSL.
Note: Paypal saw a several percentage point drop in abandonment rates after deploying EV SSL.
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