Personally, I use e17;) Then again I probably got lucky with my most
recent CVS pull of it and it has been really stable for me.
Fluxbox is great for a nice lightweight WM.
Gnome is good on a slightly beefier machine for a more general all
around control.
XFCE I never got to impressed with myself.
And I stay as far away from KDE as I possibly can.
Seablade