Verisign's Extended Validation SSL Certificate

What is Extended Validation SSL ?

Extended Validation SSL Certificates give high-security Web browsers information to clearly identify a Web site’s organizational identity. For example, if you use Microsoft® Internet Explorer 7 to go to a Web site secured with an SSL Certificate that meets the Extended Validation Standard, IE7 will cause the URL address bar to turn green. A display next to the green bar will toggle between the organization name listed in the certificate and the Certificate Authority (VeriSign, for example). Firefox 3 also supports Extended Validation SSL. Other browsers are expected to offer Extended Validation visibility in upcoming releases. Older browsers will display Extended Validation SSL Certificates with the same security symbols as existing SSL Certificates.

- Source of the above can be found here

This can be clearly noticed in IE 7 and 8 Beta when an SSL Encrypted transfer is going on. Eg. a user signing into hotmail, a user sending his credit card information to a website. etc..(transactions/sessions which use SSL)

Also, check out the Verisign EV SSL Demo