Criteria to measure manufacturers linux-friendliness.

Project:Linux hardware
Component:Documentation
Category:feature request
Priority:normal
Assigned:Unassigned
Status:active
Project wiki:Hardware
Related pages:#98: The most Linux-friendly hardware manufacturers
Description

See my blog post for the context:
http://linux.overshoot.tv/blogs/augustin/shopping_and_linux_hardware_sup...

Please help brainstorm a list of criteria to measure hardware manufacturers' linux friendliness.