I use Litestep shell (not an OS, I know!) to cover up the horrors of XP and reveal my MASSIVE desktop. I'm a big fan of the minimalist style.
Ah yah, XFCE is nice if you want a complete desktop enviroment like Gnome. Last I heard, the file manager with XFCE sucked, which is no problem because you can just use another one (I don't really keep up with XFCE so the file manager might have changed)
I'm addicted to KDE.
It just has too much eye candy.
I really like KDE... but I haven't used too many times these desktos, so I can't say too much: GNOME(only once... ), fluxbox (2-3 times... don't like it too much), etc...
I've been using GNOME for a long long long time. I'm lovin it.
For my Linux machine I currently use KDE, which I like, but I've also used GNOME, which I also thought was pretty good. KDE seems more like windows while GNOME seems more like Mac.
with KDE you can change some settings so you can have the double click... the maximize/minimize when double clicking the window title... etc. Dunno if you can do the same with gnome, but I guess you can
I use ubuntu linux. So GNome is my favourite. I used to like KDE but I think I like the simplicity of GNome.
OS X Aqua is my first love. It is the simplest user interface ever.
I'd say the Worplace Shell from eComStation was my favorite of all the OSes I tried, right next to the BeOS tracker...
I don't quite like Gnome.. the interface in KDE is nicer..
KDE, KDE and sometimes KDE.