Look at Ark's kpersonalizer. We have two extra options. The Ark option
is a vanilla visual theme, but the keyboard shortcuts are changed
slightly. We also have two for Mac (classic and OSX) whereas vanilla
has one. Also, looking through the SRPMs, we have a couple patches to
make Mission Control integrate nicely. I think the point is that
different people are used to different things. Windows and Mac users
especially tend to be stuck in their ways due to limited choice and
high cost. I still find myself trying to push Win for the Kmenu and
Win+R for Run Command, and I haven't officially used Windows in four
years.

-- 
Kris
"Piki"
Ark Linux Webmaster
Trinity Desktop Environment Packager