If you feel you need a sensing resistor, then you need to put a potentiometer in to start, and find out where the cut-off is, and what value works best. There's a few situations where a resistor makes sense, but I can't see most setups needing it. Running them straight to the breadboard's ground bus seems to work for me. Technically, you don't need the resistors if you're not trying to limit the current. 6 amp motors weren't running on 9V with 10 ohms, a potentiometer indicated that the max for the current sensing resistors is 4-5 ohms for my motors.
If the resistor is too big, a motor won't run-I found this the hard way, using pyroelectro's suggested setup. The current sensing resistor is in series with the load-the bridge ground is separate than the chip ground, as stated. It might not work if the pin is simply not connected. Blamski, Try hooking the other input pin to ground.
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