The KDE on Cygwin project has successfully ported KDE 2.2.1 to
Cygwin. What this basically means is that you can now have a recent
KDE running under Windows with the help of Cygwin and
Cygwin/XFree86. This is an early port in pre-alpha form so there
are still problems, but a large part of the issue has been tackled.
Many congratulations and kudos to the hackers involved. Check out
the faq for the answers to the most common questions.