VAG-COM is the best way for resetting the throttle body, but it also can be done without it. Disconnect your battery for 5 min., reconnect it and leave the ignition on for about five minutes; you'll hear the different valves going through all positions. After that let the engine idle for another five minutes and then go for a testdrive- try to simulate all possible driving situations from low rpm to high rpm. The throttle valve/body has to learn the different positions by this procedure.
With VAG-COM the hole thing takes just a few minutes; IMHO the nicer way to do it.