Dell recently started selling laptops with Ubuntu and ARS Technica decided to review one of these systems:
Open source software provides an alternative to commercial proprietary software, which—much like music that is encumbered with DRM—can only be used in the manner dictated by the creator. Ubuntu liberates users from arbitrary restrictions and doesn't contain invasive antipiracy spyware mechanisms like Windows Genuine Advantage.
Favored by a growing multitude of software developers and Linux enthusiasts, Ubuntu was the obvious choice for Dell's first forceful foray into freedom. Dell currently offers Ubuntu on a handful of different systems. I tested the Dell Inspiron Notebook 1420 N preloaded with Ubuntu 7.04.
Check it out over here. The site gave the system a 7/10 but says they could bump this up to 8/10 if Dell would upgrade the operating system to Ubuntu 7.10.