This is some very useful information. I've also got a MBP Santa Rosa i bought in late 2007 and it only has 2 finger scrolling. I'm looking at upgrading the top case into a penryn style, and hopefully i'll have some luck with finding some parts and swapping it out. Just out of curiosity, do you guys have any videos posted on youtube or your personal sites that shows this mod upgrade in full effect? many thanks again guys! Harris