Build Differences between the T4x and the T6x series?

[Gendou]

Can anyone who has extensive experience with both models outline the build differences between the two? I've seen a lot of time (and argument) devoted to the differences in the keyboard (windows key) and touch pad (smaller buttons, no color)... but are there other build differences between the two series?

I've only recently come to appreciate the T4x series, as we recently got some here at the office to replace our aging fleet of Dell Latitudes. Compared to the Dells... well, there's just no comparison. It was, for me, love at first sight. Everything about the T43 seems ideal to me, from the size and weight to the keyboard layout.

So I was wondering what (significant or minor) differences there are between the T4x series and the newer T60.

[BillMorrow]

when the T60's land and we all have a chance to evaluate them in comparison to the T43's and earlier models the truth will come out..
keyboards are very subjective..
the loss of the colors is something i will personally need to judge..
when i use one..
FWIW i have a T60p on the way but it is for a customer and not the one i wanted for myself..
MAYBE he will let me open it and take a look..