yep i got it going great - untill i cooked the wrt54GL by putting the wires round the wrong way. (stupid me)
But however before that happened it was running well
How it worked:
R/C car contains a chip commonly known as RX2 chip. If you have a car you simply get the datasheet for the pinouts of the car driver IC and solder the forward, left, right etc wires on top of the pins and connect them to the arduino. (A digitalWrite HIGH
to a pin will make it do what ever its soldered to).
To get the communication going I used the Logic Level Converter between the TX and RX (a TX on the arduino goes to the RX of the router and vice versa). I had a little trouble at first but turned out I had the converter round the wrong way. Once fixed i could use JB's code without making any changes. ;D
Hope that helps