finger command. With finger, you could just type in a command like finger firstname.lastname@example.org and the email server would return more information about this person. Today, Google enabled the next generation of the finger command - WebFinger - for all Gmail accounts with public profiles. WebFinger provides users with a standardized and decentralized way of sharing their profile and identity information online.If you've been on the Internet for long enough, you may remember the old UNIX
Making Your Email Address More Useful
You can think of WebFinger as an email-centric cousin of OpenID. While OpenID associates your identity with a URL, WebFinger links your identity to your email address. WebFinger can store metadata about your account and make it publicly accessible. This data can include your public profile data, information about other services that are used by this email address, a URL to your avatar, or - if you choose so - a declaration that this address doesn't have any metadata associated with it. The WebFinger metadata can also point to an alternative identity provider, which can be an OpenID server.
Update: we should note that while webfinger accounts look like email addresses - and often are email addresses - they can also simply point to a webfinger account that isn't actually an email address, too. It could just point to a public profile.
Adding Value to Google Profiles
With Buzz, Google already put a lot of emphasis on Google Profiles and today's announcement increases the value of these profiles even more. It's important to note, though, that WebFinger is an open and free protocol, so any email service and identity provider can implement it. You can find more detailed information about the WebFinger protocol here.
Image Credit: Flickr user purpelslog.