Q: Does the iPod touch have Bluetooth built in? Can I use Bluetooth headphones with it?
A: Although there have been some rumors that the iPod touch might have the physical Bluetooth hardware in it, at this point there do not appear to be any Bluetooth features enabled or available on the iPod touch itself.
Note that the iPod touch is closely based on the design of the iPhone, and the Bluetooth feature in the iPhone exists merely to support phone headsets, and does not support stereo audio.
As a result, the current implementation of Bluetooth in the iPhone would not have any application on the iPod touch.
If the rumors of Bluetooth hardware being physically present in the iPod touch are true, however, its entirely possible that a future firmware update could add Bluetooth stereo capabilities..