Its true that you should allow your content to be available to any browser on and device. But this crazy place we call the internet has advance so much, practically anything is possible - aslong as we dont have to target IE6!
Non standards compliant browsers are holding us all back and theres no real reason they should be, all the best ones are free.
So while we would never dream of excluding anyone from out content, if they want the full experience there gonna have to pull up there boot straps and get a real browser!
For more thoughts like this check out the PIMP (Progressively IMPressive) methodology
