True that, the IBM/Lenovo keyboards are the cat's ass, period, i did notice my latest (t500) was a bit flimsier (they saved what 3 oz?) drilled up with holes. I have noticed a difference in typing fast on keyboard this but am certainly still very happy with it.
I used to find the older (5+ years ago) Toshiba's VERY solid to type on and in general, but that was then, and even then the IBM's were solid as could be, although i just purchased this T500 (2 weeks ago) i am already considering my next Lenovo (#6)