MS Details Last.fm on Xbox Live, Marketplace Changes 82
Two of the less prominent announcements during E3 were that Last.fm would be coming to Xbox Live, and so would the ability to purchase games that were only available through physical media in the past. Microsoft has now elaborated on how those services will work. According to Kotaku, "The [Last.fm] service will be made available later this year, and will be free to all Xbox Live Gold subscribers. Once accessed, the Last.fm section of the 360 dashboard will function in much the same way as the popular internet radio station does on your PC." The Games on Demand service will let people pay the actual cost of the game with a credit card, bypassing the Microsoft Point system if they want to. To start, the service will be focused on making the popular, but older games available, rather than launching new games through it. Licensing for the games will work in much the same as for Arcade games now, so players will be able to re-download deleted games at will.
Move an XBLA game to another Xbox 360 (Score:3, Informative)
You could move a steam game from your main PC to your laptop, your grandmothers' machine, etc.
Likewise, Wikipedia says [wikipedia.org] Xbox Live Marketplace purchases are associated to both a console and an Xbox Live account. This means any logged-in Xbox Live member can redownload any game that he has purchased to any Xbox 360 console, but it won't play unless he's logged in.