Your best bet would be a Bluetooth device, as stated by above. But I will warn you that it is not as good as you might think.
I bought the midrange (can't remember the model number) Bluetooth headset from Motorola and a Bluetooth USB adapter thinking the same thing. Well, the mic communications were not very good and the sound did suck. I got nowhere near the range of the specified bluetooth abilities (got about 15 feet away from computer and the bluetooth would lose sync).
I would strongly suggest you save your money. But if you really want it, it can be done.