I guess it comes down to Zookster's observation that Hulu doesn't offer the old broadcast shows in 5.1. That's not cool.It's connected to the receiver via coax input.
Then again, it seems like Netflix and/or Amazon wasn't offering 5.1 with the later Star Trek series last I checked. ST:Enterprise had respectable surround (I have them on my Hopper as I recorded them commercial free off HDNet).