I remember when my own site logs showed something like 95% IE and rounding errors of other browsers.
Back in those days, you sort of had two designs--the clean, compliant, pretty, hack-free one you wished you could use if IE6 (or 5) didn't suck so horribly, and the compromised kludge you actually created so that 95% of your audience actually saw something reasonable.
For me I was seeing more iOS traffic than any other browser, period, years ago. IE is practically down to a rounding error at this point.