This just in from Michael Schwern:
In order to improve recognition of CPAN authors and help users to empathize a bit more with them before they send off a scathing "OMG YOUR MODULE IS GARBAGE I HATE YOU!!!" bug report, search.cpan.org now includes pictures of the CPAN authors. Now you can see Graham Barr's grinning mug or RJBS's shining brain dome or Michael Schwern's secret Lorikeet overlord.
The images are drawn from gravatar.com. A Gravatar is a Globally Recognized Avatar. It's pictures associated with an email address. You get the picture for an email by constructing a simple URL to talk to gravatar.com. Gravatar::URL does this for you. search.cpan.org is simply getting the Gravatar associated with an author's cpan.org address. If you're a CPAN author, just sign up with gravatar.com using your cpan.org address and upload a picture.
The Gravatars are cached by Search so if you add your own give it a day or so to catch up.