It's supposed to be for Americans only at the moment, not sure why, but you can get it working fine over here with a little playing around.
I tried to make the img file size as small as I could but any less than that and the quality went down hill fast.
I really like it, I do use my Xbox a lot so it's good to be able to look at messenger and see who's on. You get the little alerts like you do with normal MSN when someone comes online or invites you into a game.