Just an FYI (and tbh I can't believe it worked first time myself).
Got a thread to post in it's own right which may come sometime sunday, but:
Take 1x Abit IX48 GT3 (Onboard RealtekHD, just ALC888), DTS 5.1/7.1 available.
add 1x Quality built (even with loud cooler) EN9800GT gracious prize from ASUS
Throw in, Vista 64 bit, Q6600/4g.
Connect the spdif (optical) out from the onboard to the spdif (yep the gfxcard actually has an optical input aswell as a header for coax).
Download VLC, take a cheap 5m HDMI cable and connect it from ur Samsung L32 (setup as a 1920x1080i resolution), and hmmm we have audio whilst watching Matrix Revolution
Excuse the bumpage, but this hasn't worked since...
EDIT: Linky to HDMI cable £10 -
http://www.amazon.co.uk/Labgear-Premium-Gold-Plated-Cable/dp/B000GHOT86