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'.