The beta of Ubuntu's next release (7.10 Gutsy Gibbon) is out - time to review the well discussed decision to incorporate desktop effects by default in this version.
Since this topic has caused a lot of confusion lately (especially since Feisty introduced it's Desktop Effects), I feel it's time to shed some light.
Let me say this right away: the desktop effects in Ubuntu are Compiz.
Unlike Xfce there is no support for compositing effects in GNOME (it would be possible but nobody makes use of it right now) and the same goes for KDE (but this will change at the end of the year with the release of KDE4).
In addition to that, the desktop effects of Xfce are very basic and can not really be compared to the many possibilities of Compiz.