KDE

KDE から Bug fix 版の 3.1.5 が公開されている。

The KDE 3.2 Beta 2 User Review from OSNews

KDE 3.2 is the fastest Desktop Environment that I have used. It's much faster than Gnome 2.4 or XFCE 4. In terms of productivity, it beats the crap out of even Windows XP.
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If you use Linux as your primary OS, and have some experience using KDE or Gnome, I'd strongly recommend you to take the plunge (even with this beta) right away!

という評者の結論。