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I was trying out remote desktop on Linux (command: rdesktop) and it does something that the Windows XP version can't: Widescreen. It take full advantage of my 24" Dell FP2405. It also has options for bitmap caching, sound forewarding, and local printing, among others.
(I'm pretty sure macs use this version of remote desktop too... could be wrong)

Linux is also catching up to the next generation of windowing systems: http://www.freedesktop.org/~davidr/xgl-demo1.xvid.avi
I wonder if Apple's interested in using some of this cool X server technology.