I bought a bluetooth headset today, an iTech headset that has a line in for your iPod (or any other media player) as well as the line out headphone jack. So now I can be humming along to my iPod, and if I get a phonecall, switch the headset over to cut out the iPod, and take the call, when I'm done, I can switch it back. It saves a lot of hassle of taking out the iPod headphones, getting the phone out and answering it normally. There are decent pics and a description of it
here.
All I have left to work out now is using it as a microphone on my Mac. The bluetooth sees it, and it comes up as iTech, but it won't pair because of the macs bluetooth hardware. I have a D-Link DWB-120M, I think this is the problem in getting it (and me) to talk to the computer, I think the DWB-120M is an older type of bluetooth chip that doesn't work properly with newer bluetooth stuff (I had it free with my Palm Tungsten T (now handed over to my mum), so whenever that was available, thats how old it is. If anyone can confirm that then I'll be happy that the problem is with the D-Link and not something else.