I've been seeing increasing usage of GRAvatar (Globally Recognized Avatar) in blogs lately, but have shied away from incorporating it into Blogography because most implementations I've seen have totally destroyed the page layout. But now Neil's gone and done it, and his layout was preserved just fine, so I thought I'd go ahead and try it.
Gravatar (not to be confused with the Atari video game Gravitar) is a global repository for "avatars" (little pictures that identify you to others online) which can be used in all kinds of web environments, including blog comments. Since Blogography is now Gravatar enabled, any comments you leave will display your avatar, assuming you have signed up for a free Gravatar account and use the same email address you signed up with (but don't worry, your email address is private and will never be displayed here).
Each avatar you upload to your account is individually reviewed by the Gravatar staff, and given a rating of G, PG, R, or X. This allows implementations to be safely restricted for the intended audience (I've set the rating here to be "PG" or lower). The avatar I uploaded was reviewed and rated "G" (hah!) within 20 minutes. You can see how Gravatar works by following the "comments" link on this entry.