I'm in a similar situation, but with an oversized (25x26) 2 car garage. We were pretty well organized (or at least it wasn't a complete mess), until my wife's grandfather passed away. Since we have the biggest garage in the family, everything ended up at our house. While I'd love to get rid of most of the stuff we have, I don't have the emotional attachment my wife and in-laws have to the stuff.
I've gone through several cleansings, but it always ends up a mess again. My last effort was playing Moses and parting the sea of crap in the garage so I could get the Porsche in there. I've managed to keep enough space for the car, but the tsunami sized walls of crap are making me nervous. I'm definitely interested in seeing what the PPOT Brain Trust has to offer.
Here's my garage in one of it's cleaner formats:
jabb - maybe those will make you feel better....