This assumes you have a new enough AV receiver that does HDMI switching and that all of your equipment has HDMI output.
Let's see.... I have my TV, HR24, DVD changer, DVD burner, the Wii ... so 5 things to deal with in the AV receiver (which does not have HDMI switching)
My way of thinking currently, and this can change, is that I'll let the AV receiver handle audio and let the TV handle video. So HR24 goes HDMI to TV and optical audio to AV receiver. DVD burner is component to TV and optical to AV, DVD changer is component to TV and coaxial digital to AV, The Wii just gets plugged into the DVD burner since it isn't hi def anyways and so the DVD burner's connection to TV and AV get used for that. The TV has it's own optical out to the AV receiver for OTA in surround sound..
So my AV receiver is using 3 optical audio inputs and 1 coaxial digital input. I still have to connect the turntable.... I forgot about that. I'd like to cut down on some equipment, but I'm reluctant to give anything up.
We really only use the DVD burner to transfer VCR tapes to DVD and we haven't done that in a while. I could probably take the burner and just put it in the bedroom. Then we could watch a DVD in there (although I doubt we would). But then I'd have to reroute the Wii connections.....
I'm way too lazy for all of this.