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"Considering that Xorg with Composite/Xcompmgr is buggy as hell (and I can't imagine how buggy is the new GL server + Cairo), yes, by the time Longhorn will be out maybe this stuff will be usable."
Yes, Longhorn has no bugs and its development is not late...
Longhorn is late, yes. But it will be delivered sooner than usable, integrated Linux hardware accelerated compositing, even if is ships at 2007. Do you believe the mess of several uncordinated projects (Cairo, Xmopmgr, Xorg etc) will be integrated fully any time soon? And what with the drivers not all supporting proper OpenGL accelaration et al.
Also, while Longhorn will have bugs, and many, none or very very very few of its bugs will have to do with compositing. For users, compositing will be a non-issue, it will just work. Minor glitches could exist, but nothing major regarding compositing, hardware accelaration etc. It's just a part of an API that MS can't afford to get wrong, and severe testing will ensure it is not wrong.