Source: Bluesnews
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Valve announces the release of Portal: First Slice for free for owners of NVIDIA GeForce accelerators, offering a sample of Portal, their first-person puzzler, to those who favor their favored hardware:
January 9, 2008 - The most recent Steam® Hardware Survey (Valve - Survey Summary Data) shows more Steam gamers play on NVIDIA GeForce hardware than any other graphics platform. In an effort to further support this popular PC gaming configuration - Steam games plus NVIDIA hardware - Valve and NVIDIA have entered into an agreement to collaborate on development, distribution, events, and more.
Effective immediately, all NVIDIA gamers may receive a free copy of Portal™: First Slice, a special version of the award-winning new game from Valve, by visiting Portal: First Slice is free for all NVIDIA Gamers and "Taking the test." Steam will then auto-detect the presence of NVIDIA hardware and make Portal: First Slice available immediately, free of charge. To make it easy for all NVIDIA customers to redeem this offer, a link to the Steam offer will also be included in all NVIDIA drivers.