Dolby sent an email to inform me of their game database, available at http://www.dolby.com/games/. It "allows interested parties to run through hundreds of game titles listed either by specific Dolby audio technology (e.g. Dolby Digital 5.1, Dolby Pro Logic II, Dolby Surround, etc.) or by gaming platform. Soon you'll be able to search by publisher."
I've corrected many outdated links in the archived news section. Remember that reporting a bad link can earn you a free game.