Thanks for the link elephant! I'll look in to that.
Here's my setup currently: Main floor I have my main TV and a Yamaha YSP-4000 sound projector as this is really the only speaker I can get to fit in the small area that it has and sound pretty good. Connected to this currently I have an ipod.
Also on the main floor I have a mac laptop, and my wife has an iphone as well.
My Beocenter 9500 will be downstairs. I plan on hooking up my components (Blu-ray player, Wii for the kids, etc) directly to the TV and sending the audio out to the Beocenter 9500. I was planning on hooking another Ipod to it as well but then I found out I could hook up an airtunes express. My speakers have yet to be purchased so for now I will hook up my Beosound 1 to the headphone jack.
So, after reading I was pretty excited because I could just hook up an airtunes express to both my Yamaha and the Beocenter and have the music synced downstairs and up, and even expand it with other Beocenter+speaker setups/Beosounds later in other rooms!