As stated above, the PS3 controller cord is a Mini USB, and the droid uses a Micro USB. They do make adapters (i have one) that you put on the end of a Mini USB cord to make it adapt to Micro USB.
monoprice.com rocks! I bought a few 10' cords for $1.65 each. My VZW store wanted $12.95 for a 3' chord...
You do have to be careful what you order. There are more than one microUSB cord out there - my Razr had a larger connector on the micro end than the Droid has.