Designer’s (of which I am one), are beginning to wrestle with the consequences of implementing Ajax, Flash and other rich interface technologies on the web. 
Among those consequences, is what to do with the "Back" button. It alone is responsible for almost 50% of web user clicks on today’s web.  However, it can lose its usefulness–In fact become somewhat of an obstacle– on sites powered by Ajax, Flash, and other Rich interface technologies. 
Mike Stenhouse of Content With Style believes that the back button is too important not to spend significant design and development time making certain it functions properly on Ajax web apps.  Without it…
The most fundamental online behaviour – click then back, is broken.
and sites become irritating at best, downright unusable at worst.  Ensuring that Ajax, as a web standard fails.  More here

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