Logitech has a new "affordable" Bluetooth headset on the way, as long as you consider $70 not a lot of money for a fancy speaker and microphone. Believe it or not, I've so far resisted the Bluetooth headset thing, mostly because I don't need one, but also because it pains me to pay almost half-again the price of a phone for something I'd really like to see bundled in. But hey, it's a step in the right direction, at least.
Logitech also announced a "Pro" model which will use AFH (Adapative Frequency Hopping) to prevent interference from other 2.4GHz radios, like Wi-Fi and cordless phones.
Hip Gear XB-Comm Bluetooth Xbox Controller with Headset [Gizmodo]
Bluetooth Headset Archive [Gizmodo]