Tom,
I've pared down some *L* oh man, if it was up to me every room would have a system. I'm really irked we don't have a kitchen system but she's being unreasonable. Let's see...
My main system lives in the family room, as does the home theatre thingy. I'm fine with that, we share the room.
I have three kids (12, 13, 15) and they each have their own systems. We need to bring the kids into the fold.
Bedroom system, including a pair of speakers in the bathroom. I like to S/S/S to tunes.
Garage system, a must! I tinker, mod, work on stuff so I have to have my tunes.
Outdoor system, facing the pool. A cold beer or great Merlot, a Cuban cigar, and really loud swimming trunks. Ideal.
Office system. C'mon, you can't work without a high-end system to rock out to. Output would suffer or I'd hafta kill dozens of people.
Basement system is a simple TV and VCR/DVD set-up to keep the kids out of my hair (and let me enjoy my main system).
Traveling system, no man should be without when he's on the road. iPod, speakers, CDP, cans, headphone amp
I have an extra system I was using in my office, but now that I work from home it's gathering dust. I guess I'm at an even dozen. Cars don't count eh? hmmmm.. probably forgot one or two all the same...