Thats good to hear about the no delay issue, I may have to consider a DDLive type card for my next PC build.
My current computer has a Creative Audigy 2 ZS Platinum sound card. I just recently connected it to my home theater system (that I put together using advice on this forum). I connected both the optical out and analog 5.1 inputs to my receiver. This way I can get surround from games over analog, and pass through 5.1 sound from movies to the receiver for decoding. Stereo sources like music can be played over either input.
I had to do some tweaking to get the bass working correct. First, most receivers that I know of do not apply any effects or equalizer settings to the analog inputs, they just amplify them and pass it on to the speakers. The .1 (bass) track of movies is recorded 10 db higher than the other channels for more effect. However the sound card analog outs do not boost the bass by 10db, so I had to go into my receiver settings and adjust the bass for the analog inputs up 10 db. It sounds perfect now. Also in the Creative speaker settings there is a bass management tab, it has a checkbox and slider for bass redirection. This makes a difference for stereo sources over digital and analog. I think it has to be unchecked for digital and checked for analog for the bass to be correct.