Let the hive mind of Engadget get that for you.
"I've found myself using my PC for a lot of conversations lately, and I'm also considering recording a podcast to share with anyone who will listen. There are tons of USB headset / microphones out there, and I'm hoping someone has some solid recommendations based on experience. I'll consider both headsets and standalone mics, by the way, but I'd like to keep the bill under $100 if possible. Help!"
This isn't new. It's been around since at least firmware v1.0.2 and has been documented on numerous iPhone websites. Here is an example of a post from August 24th http://applephoneshow.com/index.php/archives/752
Wait - it's A2DP? That would be awesome since it would FINALLY get companies to make good A2DP accessories I could use with my WM6 phone...