Color Filter Array Ideas Paper

In lieu of all the buzz around the "new" Kodak color filter technology, here is a good article by John Savard summarizing the history and different ideas on color filters design.

There used to be a great Fillfactory paper on the same subject, but I can not find it on-line anymore.

Update: As someone mentions in comments, the old Fillfactory article is archived on Wayback Machine: RGB FAQ. Thanks for the link!