I like these articles, they compare most graphics cards you are likely to find, and help finding a product whether you want to spend 300$ or 40$. Sure it's all an approximation, but once you find your card you can always digg up a review and find out that it's loud etc..
I wonder, though, why it includes mobile chipsets but not the intel ones, they seem to be most used (would help in deciding whether to go for dedicated gfx in a notebook).
What I think would be cool would be a little mention to help the people who build HTPCs and silent computers - they want to know which are the most powerful passively cooled solutions, and the most powerful cards that still work with (i.e.) a 300 watt psu. I dare say there might be more people of this category reading this article than the ones sitting on the aging agp bus. In this category might also fall the most powerful low profile card (for htpc people and people who want to upgrade their slim pcs).