It might not be the daintiest of dongles, but Microsoft's Xbox 360 Wireless Receiver gets the job done
. It's been spotted out in the wild for months now, but today it's officially here -- on retail shelves. $20 will score your PC some quality time with Microsoft's wireless Xbox 360 peripherals; for $60, you'll get the receiver, plus a wireless controller.
All 'Games for Window' branded games natively support 360 accessories. The controller can also be used to navigate Windows Media Center; the headset for VoIPin'.