So what do you do, target a browser and tell everyone that your site only works on Firefox 2 but not 3. Or you could use IE7 but not 6.
Or if you use chrome you have to turn off a certain feature.
It is bad enough with the referrer issue with Norton,Etc.
And dealing with different settings for each internet security settings.
I know it is a big issue, but where do you draw the line?