I use this cut table to cut all of my plywood to the exact size using my circular saw and a straight edge. Cutting of course is fairly distructive to the table but it's cheap and the badly cut up pieces can be flipped over or swapped with other pieces.
It folds flat and can be hung on a wall using ladder hangers. "which I plan on doing once I can reach a wall in my garage.
edit: It's 8' long by 35" wide. It uses 4 - 2x4's and two folding table legs.