Some sites have the ability to grab your profile picture after you sign up for the first time without the user actually uploading a pic. I think stackoverflow has this functionality at sign as well....How does it work?
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It uses gravatar.com I believe. You associate an avatar with your email and then sites can use your email to locate your avatar. There is a plugin for Wordpress. Or google search 'gravatar API' to put it on your own site.
Good luck!

alex
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stackoverflow uses gravatars which are linked by your email address. You can read more about how gravatar works on their developer resources page.

Jared
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There is a site called http://gravatar.com that takes a MD5 hash of your email to load a profile picture

bendewey
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They're using OpenID. Some OpenID providers allow you to upload a profile picture or it wil associate it with your Gravatar's e-mail address (http://en.gravatar.com/).

Chad Moran
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