There's an interesting shift happening in the Bluetooth headset market, with the swelling ranks of cheap devices now being accompanied by an expanding niche of high-end headsets, focusing on features like audio quality.
Take the new Sennheiser VMX 100 for example, which has just been reviewed over on the main Mobile Choice site. It sports two microphones and Digital Signal Processing to ensure unwanted noise gets screened out, so your voice comes through loud and clear.
Poor call quality has been one of the things that's stopped many mobile users from going wireless (well, that and their shame at walking down the road seemingly talking to themselves, of course). The development of headsets like the VMX 100 should help sway some of those refuseniks. Now, if Sennheiser could make an 'I'm Not Mad - I'm Just On The Phone' hat, they might persuade the others...