i just actually built a multi-keg kegerator and used these to fork off the CO2 (forget where i bought them from, not here, these are much more expensive...)
1 cross = 3 taps
1 cross and 1 tee = 4 taps
2 crosses = 5 taps
2 crosses and 1 tee = 6 taps
as long as you have a disconnect on the ends of all of the lines, you dont need shut off valves like on an expensive manifold.