The GeForce4Go 4200 requires a converter to be used on laptop motherboards because of the different interfaces. It is a power sucker, as has been mentioned, and its features are comparable to that of the M9... The desktop Radeon 9000 (obviously better than the M9, but really not by all that much, just that it can have 128 megs of ddr ram) is comparable in practice to the Geforce4 ti 4600. My friend has both, and he has put them in the same computer (swapped them) and ran them... Yes, the ti4600 gets better numbers on the benchmarks, but my gosh in the actual games the radeon is gorgeous... I don't think the power drain and the heat produced is worth the risk of even trying to design one of these systems with it. Also, even if Dell does, their laptops won't come near the performance of a sager with a desktop processor and all of its extra sweetness.
The GeForceFX is already out, and is being shipped with desktop systems. It's amazing, period. But the Radeon 9700 is pretty darn amazing in and of itself, despite being several months older... So, ATI's next card will be !!!!! both for desktops and for lappies, since ATI also tries hard to keep battery consumption to a minimum. Any numbers comparing battery times between an nvidia and an ATI will show you that (even if it's a 420 or 440 Go and not the 4200, lol, which will take even more power). I would wait for th M10 if you are willing to wait... It will be out after the 4200, but not by long. I doubt sager will try and incorporate the 4200 unless nvidia makes major changes to the heat output (which will undoubtedly lower that card's performance enough to make it equivalent to the current M9... which, admittedly, is pretty darn sweet anyway :-)).
Just my 2 cents though. Talk to you all later!