Well there is two stories to that. True since when the core 2 was released in 2006 AMD has dropped in market share and stock price. If Zambezi is released with in the next few weeks, its took AMD 5 years to be atlease competitive.
But the other side is between 2000 and 2006 AMD has Intel beat clock for clock. The very same thing would have had happend to Intels market share and stock price if Intel didnt use unfair and in some instances unlawful business practices to keep it from falling through the floor.
So you can look at Intel from two perspectives.
1. Intel was a good company that did it for the sake of their company.
2. At the same time spent billions of dollars in pay offs to OEMs to keep market share resulting in a fools game selling inferior products to customers instead of spending it on research to release a better product.
It took Intel with a research and development budget that is higher then AMD total income 6 years to beat AMD clock for clock. AMD has been, what 5 years now working on a new processor that should be out in a few weeks that will atleast make them competitive again.
Either way you look at it, Intel pretty much sucks as a company and is willing to screw you over as a customer without people even realizing it. Dont get me wrong, I am not a AMD fanboy. There are only two dogs in town, and one is willing to bite your kid in the face over its dog food bowl. So I pick the other.