All of the eContent providers have stereo (2.0) channel audio. I know Pandora doesn't offer split audio, and can't speak for BlockBuster, but I did call up Netflix this evening. They did note that while some movies show in HD (titles under the HD "genre"), none of the titles stream 5.1 audio.
Now, if you want the audio to come out of more than two speakers, there are often matrix settings on receivers that process the signal so that it's heard through more than 2 speakers. But the source is 2-channel audio.
Just wanted to add something regarding the Wireless Dongle supplied with the BD P3600. If you dont see the "B" Button lightup with WPS next to it (NOT IN THE MANUAL), your dongle is probably bad. I had to bring my unit back to best buy to get another unit. Worked fine afterwards.
However, while listening to Pandora, or Blockbuster or You-Tube, how come I only get 2 Channel Stereo? Isn't this supposed to be at least 5.1 Audio? My setup is Audio Settings PCM Re-Encode with Optical cable to 6.1 Receiver?