On a pre-unibody MacBook, the trackpad is part of the top case (if I'm not mistaken, they are inseparable?), but I was...

That's still pretty great news robignorant! Can you provide any further details, something more specific than "The trackpad from the earlier macbook pros can be fitted in there"? Maybe an Apple part number or which specific MBP model you meant? And what do you mean exactly by "the silver trackpad doesnt match the white case"? In color only I assume (no big deal for me, it would be a worthwhile tradeoff), but in the event you mean that the silver Trackpad doesn't quite fit in the white topcase, and you somehow squeezed it in forcefully, I'd like to know about it. Also, was the white Trackpad easily separated from its topcase, or did that require some special technique to accomplish? Finally, the silver multi-touch Trackpad you used had the exact same connection interface as the white one you removed? This seems to go against other reports I've read (including TommyJames' above), so it's quite interesting if that's the case. Again, thank you for this encouraging news and anytime you get a chance, please...