Games for Windows Live is already free. Purchasing games on the service would be nice. Though I believe no one would ever use that. Why pay when you can pirate them? I pay for most of my games. I do admit I have pirated one or 2. Out of game client, that would be extremely nice. I'd love to be able to sign in and chat with everyone without opening up a game. Thats something I would use alot. Might even make Games for Windows more interesting for other people. I personally have not really tried Steam except once I used it to download the free Portal game a while back. Still haven't tried to play it yet. I normally purchase my games through D2D (Direct2Drive).