Nexxus Drivetransmit Pro - bluetooth FM transmitter
Received one of these in the mail today:
(Warning: I got mine from memorybits.co.uk; I warn you that the customer reviews of that place are dire but I didn't see them until after ordering. However, I got it in 2 days just fine, so YMMV).
It's pretty decent- connects as an A2DP unit and then all audio is routed via the car stereo. It's a little dumb at finding a "blank" radio space (seems to pick up the tail ends of real stations and use them instead of actual space) but the audio quality is clear and static-free.
I called my home landline and the wife says she can hear me just fine through the microphone that's built into it. I didn't try the USB charging just yet, although that's a really nice thing to have. You can hang up, answer calls, play/pause and next/previous track with the buttons on it.
The only real problem I've found so far is that there are little rubber strips down the side of the cigarette lighter adaptor that are meant to hold the unit in place and stop it moving. DO NOT
turn the unit when it's plugged in- you WILL tear these strips off, as I found.
Once it's plugged in, you will have enormous difficulty getting it out again; just don't do what I did and twist it.
Overall, it functions nicely as a hands-free + audio unit. I'm stoked to get music from my phone in the car, as burning CDs was getting highly annoying. For £18 it's a complete bargain as well.
If you do happen to order from memorybits.co.uk, do use a full credit card. Last year a bunch of people complained that their orders weren't turning up etc. It looks like the site was bought out by someone else and seems to be doing business okay now, but I wouldn't take the risk. Play.com has a looooong waiting list for these.
Hope this helps someone.