You went for the wired pad? Should have picked up the wireless receiver. You could then connect up to four 360 pads to your PC with ease. Perfect for emulation (especially multiplayer arcade games). Also works well for a lot of those doujin games that demand multiple people (such as Drill Milky Punch).
I love 360 pad support on the PC, though. It always annoys the shit out of me when a PC game, that is also available on a console, is released without pad support. I still can't believe FEAR 2 did not offer pad support. I mean, the original FEAR (initially a PC only game) had pad support AND FEAR 2 was released at the same time on consoles. It's just bullshit.
Have you checked out Pinnacle Game Profiler? It's really impressive software that, I think, far exceeds X-padder. It isn't free, unfortunately, but I thought it was worth the $20 or so just to get such awesome pad support in games that typically don't support it. It really allows you to tweak so many settings that it almost feels natural and the profiles are a nice touch.