Wow, I didn't know individual electronic components had datasheets of their own. I always just saw them lying around in bags at Radio Shack I've been wondering how to do it.
As for capacitors, its best to use 100uf for about every 250mamps. So at say 8amps a motor, I ought to use 3.2f capacitance for each motor. I probably ought to put some close to the batteries as well. What do you guys, think?