For my professional couetmpr I still run Windows XP, since my company requires it. On my personal couetmprs, however, I've run Ubuntu for about six months, and I'm very satisfied with it. Also, my girlfriend runs Ubuntu ever since her Windows XP installation crashed some months ago. She's very happy with it, even though Gnome is a bit different from both KDE and Windows.I'm actually surprised by how easy both setup and installation of new hardware is, comparing to what I've expected. I also like that the desktop version comes fully installed with OpenOffice, Firefox, Evolution and other applications that might come in handy.Ubuntu is truly a step towards Linux being a serious desktop alternative.