DOOM 3
AMD Athlon 64 4000+ power is able to overcome a 2.13GHz Pentium M at the lowest setting. Make the test GPU-bound and NVIDIA's fastest mobile GPU matches a 6800 GT 256MB card with ease. 1920x1200 looked great and was eminently playable.
Ever thought that DOOM 3, run at 1920x1200 4x AA 8x AF, would be playable on a laptop? Well, it is, kind of.