Stream Theory, which provides streaming application technology, has filed a patent infringement suit against three other companies (Softricity, AppStream and Exent). Stream Theory has a Games on Demand series with over 550 PC games available.
One of the defendants "? Extent "? is known for providing games on demand; the other two defendants provide other forms of streaming software.
Coverage at http://shorl.com/jefyfafrifredy (Gamasutra)