How quickly do users actually upgrade their browsers? It’s a question that seems to come up frequently and is definitely on the minds of developers who want to know when they’ll be able to leverage the best features for their apps. Overall, I think the major browser makers try to share important usage information but the this specific data isn’t reported often enough. It was great to see that Pingdom did their own analysis of the issue and even offered a comparison of the upgrade mechanisms used by the browser makers.
Ajaxian � Getting Users to Upgrade Their Browsers