I've (finally) finished my soldering tutorial covering all techniques required to install/remove a modchip of any kind. My original intention was to have this available weeks ago, but my aging digital camera made capturing the images a bitch. Grrr...
I've submitted it to Xantium, and hopefully he'll have it up on the main page soon.
In the meantime, please PM or email me if you need it sooner, and I'll send it your way. Cheers!
P.S. - The photos suck, but are legible enough to be useful. I didn't want to subject my Xbox to random torture for the sake of this tutorial, so I cannibalized an old SCADA board that I made years ago. When I install my X2, I'll update the photos to show an installation in an actual Xbox.