Google Friend Connect in beta is now open for everyone, looking to add a "social gadgets" to their site. This service lets webmasters add social features to their sites by uploading two files to their root folder "canvas.html" and "rpc_relay.html", and then copying and pasting a few snippets of code, you can pick embed code for different gadgets.
“you don't have to deal with the hassle of creating yet another username and password — Friend Connect lets you log in using an existing account from Google, Yahoo, AOL, or OpenID. Similarly, you can choose to either establish a new profile or use profiles and friend sources from other social networks that have opened up their services, like Plaxo and orkut.
We've also expanded the features available to users with richer, more integrated profiles and new ways to discuss and share content, like including YouTube videos in your comments.”
To learn more, watch the video tour below: