Sadly, yes, unless your site is aimed solely at technologically savvy users. Or even technologically awake users. Sad as it is, most sources indicate that IE

Sadly, yes, unless your site is aimed solely at technologically savvy users. Or even technologically awake users. Sad as it is, most sources indicate that IE still has 70-75% of the browser market share overall, and ~40% of IE users are still on IE6. So roughly 30% of the web browsing market is on IE6, which is a rather large subset to simply ignore. Like it or not (and none of us do), the bulk of sites out there are stuck with supporting IE6 for the near future.