hi! Just in case their might be someone interested in it. In a few days the translation of a usuabilty study of the relevantive ag will be available. It is a 90 page study that can be downloaded for free and compares win xp to Linux/KDE in buisness environment. Currently only the german version is available. I think the study might be interesting in some points and seems to be very objective.
http://www.relevantive.de/Linux_e.html Steffen