The basic service is free but if you want better quality (HDTV resolutions) or more features you'll need the $9.99 Premium or $19.99 Unlimited membership option. StreamMyGame can stream games to XP, Vista, Linux and PS3 but I wonder if it really goes as smooth as advertised and I also wonder whether the lag isn't too bad.
How it works
Members receive a small 3Mb plugin called Streamer when they register. Both Streamer and standard registration is available for FREE here.
Members share their games by listing them on our website. This creates a Game Stream hypertext link. They use our website to allow other members to access this Game Stream link. By selecting this link a secure, authenticated connection with encryption is established between the member who has the game and the member who wants to play it. Our website starts the game and uses Streamer to intercept the games video and audio. Streamer converts the video and audio to a Game Stream.
The Game Stream can be recorded to a file, broadcast, transmitted over the home network and will soon be able to be sent over the internet and played on the remote computer. The encrypted keyboard commands from the remote computer are captured and transmitted back over the network and used to play the game.
This bi-directional stream of video, audio and encrypted control data is called a Game Stream.
More info at StreamMyGame.