Your best bet is to hit the magazine rack and pick up a copy of Home Theater Interiors. Great mag with some awesome pics. They show a lot of celebrity home theaters, which are always cool to look at.
I used to visit this site a lot in the past:
http://gallery.audioreview.com/
You get a lot of guys showing off their 27 inch Sanyo and their Aiwa mini system, but occasionally there is a really nice theater setup to look at there.