Microsoft is stepping up its efforts in the digital distribution market with a new deal that will bring titles from the likes of Capcom, Rockstar, THQ, Ubisoft and others to their Games on Demand for Windows platform "day-and-date" with their release in stores. This should give a much need boost to the service's games library, which is still fairly limited when compared to Valve's Steam and other online gaming venues.

Microsoft says that beginning today with the release of "Prince of Persia: The Forgotten Sands", new non-Live titles will launch on Games on Demand every week, with more than 100 new titles joining the portfolio by year's end. To celebrate their latest addition they are also offering Prince of Persia: Warrior Within and Prince of Persia: The Sands of Time, both for 75% off at just $2.49 each – or 200 Microsoft Points.

The company opened up its Games on Demand digital distribution feature late yesterday as part of its Games for Windows Live platform. As the name suggests, Games on Demand allows users to purchase titles (using a credit card or redeeming Microsoft Points) and download them directly to their PCs. Prices are comparable to other digital distribution services, ranging from $9.99 to $49.99. If you are new to Games for Windows Live you can download the client here.