Here's my guide guys. I posted it @ XS and I guess it made its way to a few other forums so I figured I'd inform ya'll here as well. FYI this is confirmed working by many @ XS as well as myself on TWO cards.
This is pretty cool, after the 2950pro/xt come out the 2900pro will likely be close to worthless, so being able to turn it into a 2900xt would be great for a cheap price/performance card.