The Razer Barracuda AC-1 gaming sound card works very poorly with windows 7. The Vista beta drivers are terrible anyway, with many features non-working or disabled. 5.1 surround sound is difficult to get working in almost any game, the only success I've had is to use Dolby Pro Logic II and stereo source with most games to get sound coming out of the rear speakers. It's different for almost every game and most don't work properly at all.
The card offers wonderful sound quality and performance, but the lack of Windows 7 drivers is a huge problem.
Thisislaw, try turning off your front and center speakers and listen for the sound from your rear or surround, you'll find that even if you do get your settings right and get it working, it isn't proper surround sound. Compared to how the card worked on XP this is miserable. I regret ever buying the card as I upgraded to Windows 7 shortly after getting it.
It's really too bad.. -_-