FYI, you can now get X, T, R, and Z ThinkPad models with Core 2 Duo.
Not too many (e.g. there's a single T -- a T60p with 2.33 Core 2 Duo),
but they finally exist. The full model list also includes 3
"Linux-ready" models -- two T60 and a T60p -- with no pre-installed
software at all. Not sure whether they're actually cheaper. :)
Thanks,
Aaron