Thanks for the responses! I guess my real problem is that I mostly watch HD programming but not Premium channels like HBO or Stars. I thought if a channel was providing a movie like "Independance Day" it would be in 5.1 and not just stereo.
I have always used the Toslink FO cable for my audio sources, so that's not the problem. I was just hoping there was a way to find HD programming with 5.1 audio, in the programming guide.
Thanks again for the responses! I'll keep watching and listening!