Thanks for your kind words and glowing review.
If I'm not mistaken (without looking), I believe you have 3 HDMI inputs on the back of the television. (2 rear, 1 side)
Here's my best-case surround sound solution:
Solution one: If you have one optical input on your HTIB:
You are correct that running the Xbox through the receiver will get your video games, as well as HTIB movies and streaming in 5.1 with the audio cable. However, the HTIB may have limited optical inputs (like... one!) in which case, you've hit a wall when it comes to your Dish Satellite.
Solution two: Assuming you have one optical input, make the most of it by using the TV's HDMI inputs and optical audio out. The difference here is that everything else has to support HDMI. Which in your case, works.
HTIB - outputs picture via HDMI and supports its own audio.
Xbox - outputs HDMI video and audio, transfers audio via optical to HTIB
Dish - outputs HDMI (?) video and audio, transfers audio via optical to HTIB
Assuming your xbox and Dish have the ability to do HDMI, you could potentially hook up your wii directly to the HTIB, as the Wii supports Dolby Pro Logic II surround sound, but not HDMI.
If you can't/won't be able to get HDMI support for either the Xbox or Dish (you could always ask for an upgraded box in exchange for your patronage!) and have a component input left over, then you can plug one of those into the rear of the HTIB and then run the Wii via component on the television since it doesn't ship with HDMI (yet).
The key here is HDMI > Television > optical out on TV > optical in on HTIB.
This will allow you to get as many surround sound outputs for the connections you have.
First, let me say I love my 52" plasma and the great sound I get from the HTIB I chose. They work great together, and look fantastic in my gameroom. My question is, how can I get true surround from as many sources as possible? I have the receiver connected to the TV using HDMI, and an xbox 360 connected to the reciever using digital audio cable. So I shouldh have true surround for DVDs and video games (as well as Netflix streaming). But, my Dish network set-top box is connected to the TV using component cables (red/ green/ blue for video, red/ white for audio), and the TV audio out has to use red/ white cables to the receiver since it only has the one digital input. Is there any way to get true surround for both the satellite and the xbox? I also have a Wii, but that's mainly for the kids so not as much of an issue there.