No 360, but I have the controller!
I bought a used Xbox 360 controller to test game development using XNA for PC and the upcoming Xbox 360. The XNA programming model works well, and I can access controller inputs like trigger pressure. I couldn't install the official Xbox 360 controller driver for Windows XP, but the XBCD drivers worked seamlessly. Find them at xbcd360guide.50webs.com (use at your own risk, the site looks a bit sketchy).