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At work, where we're running Suns, I use CDE and Sun JavaDesktop (which I try to avoid). Then I go home, and boot up my box either with gnome, fluxbox (I prefer the latter, but it seems to have problems with my dual-head setup), or XP (when I want to do some music recording).
So on any given day, I use up to five desktops, but at least two. Am I really such a minority, or did I misunderstand the question?