http://www.markshuttleworth.com/archives/131* Intel wifi (new drivers will be all-free, though still require binary-only firmware)
* Intel graphics (free drivers and OpenGL implementation that works with Ubuntu's desktop effects)
* ACPI that Just Works with Linux (suspend and hibernate)
* OpenBIOS
* 5 hour battery life (with Ubuntu 7.10 or later, tickless kernel)
* 1024x768 screen - smaller but better for battery life and mobility