Today, I spent few hours to play with Facebook Javascript client library. While I was playing with it, I started to build a little library to fit my needs for a game project.
I built something compact, there’s only 2 classes at the moment (client class and its event class). Sobriety !
It uses a JavaScript proxy like FaceBookBridge library from ZeroFractal, but the approach is a bit different. That’s a matter a lot of design and code perspective. I wanted simplicity and visibility, like remoting API.
Let me show you !

You have to make direct method calls on the client (as you would with JavaScript library). It returns a responder instance on each call:

var responder : EventDispatcher = client.Friends.get() as EventDispatcher;

To get some request results, you can suscribe listeners (as many as you want) to any responder:

responder.addEventListener(FacebookClientEvent.ON_RESULT, onFriends);
responder.addEventListener(FacebookClientEvent.ON_FAULT, onError);

And guess what, results are encapsulated in events passed as arguments to your callback methods:

public function onFriends( e : FacebookClientEvent ) : void
{
	trace ( e.methodName + " call: " + e.result.length );
}

Clean and easy as I like it.
Last but not least, you got some errors reporting. I had hard time on this part, coz the JS implementation was acting weird. I’m not even sure at this time to have understood the whole error process. I must finalize this part, few errors aren’t caught at this time but every transaction is logged in firebug with Debug.dump JS calls.

public function onError( e : FacebookClientEvent = null ) : void
{
	trace ( "onGetInfoError(" + "method:" + e.methodName
				+ ", error_code:" + e.result.error_code
				+ ", error_msg:" + e.result.error_msg + ")" );
}

Here’s a short demo to end the teasing around this project.
In this example, client retrieves all the name and profile photos urls of a user friends list through 2 API calls.

package
{
	import com.bourre.facebookflashapi.FacebookClient;
	import com.bourre.facebookflashapi.FacebookClientEvent;

	import flash.display.Sprite;
	import flash.events.EventDispatcher;

	public class FacebookClientTest
		extends Sprite
	{
		protected var client : FacebookClient;

		public function FacebookClientTest()
		{
			client = new FacebookClient();

			var responder : EventDispatcher = (client.Friends.get() as EventDispatcher);
			responder.addEventListener(FacebookClientEvent.ON_RESULT, onFriends);
			responder.addEventListener(FacebookClientEvent.ON_FAULT, onError);
		}

		public function onError( e : FacebookClientEvent = null ) : void
		{
			trace ( "onGetInfoError(" + "method:" + e.methodName
						+ ", error_code:" + e.result.error_code
						+ ", error_msg:" + e.result.error_msg + ")" );
		}

		public function onFriends( e : FacebookClientEvent ) : void
		{
			trace ( e.methodName + " call" );

			( client.users.getInfo( {uids:e.result, fields:["name", "pic_big"]} )
			as EventDispatcher).addEventListener(FacebookClientEvent.ON_RESULT, onGetInfo);
		}

		public function onGetInfo( e : FacebookClientEvent ) : void
		{
			for each ( var o : Object in e.result )
				trace ( "Nom:" + o.name + ", Image:" + o.pic_big );
		}
	}
}

I will release the source code under an open source licence when it’ll be a bit more polished for people who want to try it, and maybe I’ll make a video tutorial, who knows !