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I thought i'd make this post to help any beginners that also run into this problem, i wasted a good hour and a half on this, so hopefully no one else has to.

Ok, so i have my Arduino, 3 x servos and an ultrasonic range finder.  Running all these at once from the 5v that the arduino provides is not supplying enough current (i think). I can run at maximum any two of these components from the 5v.

So i guess my solution is that i need to supply the servo's with their own separate power source.

If i hook up some AA batteries to the + wires of the servos connect the gnd to the gnd and the PWM wire to the arduino, will this work? How have other people dealt with this problem?

So i've just started getting into electronics for the purposes of robots and the learning experience. 

Last night i manually built a H-Bridge using 4 transistors in a layout exactly like the one pictured here:

http://en.wikipedia.org/wiki/H-bridge

I then used the arduino to control the 4 transistors turning them on and off two at a time to redirect current through the motor different  directions.

I was just wondering what other things i should look out for in a real cicuit to do this, protection diodes ?