Wikipedia
GameShadow is a gaming community website and an advertising-supported software utility that keeps PC gamers up-to-date with patches, game demos, trailers, mods and other content for PC, Xbox 360 and PS3 games. GameShadow identifies the product version of supported games installed on a user's PC, then compares them to its database to locate updates for those games. The site also offers gaming industry news, an industry blog, and a Gaming Network. It is available for Microsoft Windows only. GameShadow is based in Over Norton, Oxfordshire, England.
GameShadow was previously a subscription service, but in May 2006 it announced that it was available free.
In March 2008, GameShadow announced it had achieved over 1 million registered users, and had launched a new Gaming Network - a social community driven by the titles installed on gamers' PCs.