Check out Christopher Hansen's personal penthouse complete with Jeff Rowland preamps connected to iPods, B&W speakers next to Sony Bravia HDTVs on a lift etc...
A lot of what went into this install is hidden such as side speakers in the sofas that fire back into the wall for effects. Speakers were built into the HVAC ducts to keep the lines clean in the rooms.
I personally like the small reading room and the install in the kitchen. Really nice woodwork. Alex, the guy who did it also did the work at my house. He is about our favorite sub of all time.