It's a literally 2 minute plug-play. No additional parts needed.
If your car has a MFSW but does not currently have the push to talk button enabled, use VCDS to change the steering wheel coding. Since each car is equipped differently, you have to set the code to suit your car.
The sample codes were given in the MFSW writeup but here they are for easy reference. The codes are only for software version 0110 or higher. Since 9w7 will only work on white display MFD (which was introduced in 2010), your version is high enough if you have a white MFD. If you have a red MFD, the 9w7 VW Bluetooth module will not work no your car. The module will work fine without changing the code - this just enables the push to talk button on the steering wheel:
0001831 (automatic trans, no rear wiper)
0001731 (manual trans, no rear wiper)
0001832 (automatic trans, rear wiper)
0001732 (manual trans, rear wiper)
Here is where vwpartsman posted: http://www.golfmk6.com/forums/showthread.php?t=6791
It cost $350 from a special group buy from bmwz1 (at) earthlink.net
. I would not publicly post email addresses but he listed it himself online as his contact info. The first few rounds are sold out so you may have to wait.