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GDI+ uses hardware acceleration for many things, so yeah, I'd say that Linux is behind it currently as well.
I said hardware acceleration/3D. Those are not available for Windows yet and that is what XGL/AIGLX provides.
Vista is something like 8-9 months away from shipping, and is already feature-complete. The betas that have been released so far are quite usable, just buggy.
Well it is a lot easier to get your hands on XGL and is probably less buggy and more usable than Vista is right now.
Whether you like it or not, Linux *is* currently behind, and will be behind for the next while.
That's a pretty poor attempt at disguising your opinion as an authoritative response on this matter.