via developers.facebook
This JavaScript client library allows you to make Facebook API calls from any web site and makes it easy to create Ajax Facebook applications. Since the library does not require any server-side code on your server, you can now create a Facebook application that can be hosted on any web site that serves static HTML.
more details HERE
an good article/ opinion-Facebook Extends Platform to the Web, by Nick O'Neill
I think it's a Revolution and I can't wait to organize and manage a web project around this cool stuff.
Keywords: Facebook, Facebook API, Facebook Revolution, JavaScript Client Library, Nick O'Neill