FWIW: Here’s the most recent log from my website showing browser and version:

Msie 8.0…..29.7 %
Netscape 4.0…..14.5 %
Msie 7.0…..12.7 %
Firefox 3.5.6…..12 %
Safari…..10.8 %
Msie 6.0…..5.9 %
Firefox 3.0.16…..602 3.8 %
Google Chrome…..2.1 %
Opera…..1.5 %
Mozilla…..0.9 %

IE 6 usage is small and dropping rapidly (the decline isn’t apparent here, but it falls significantly every month, as does overall IE usage). It just isn’t worth putting a lot of effort into making code work for this steaming pile. In my case, I just don’t care anymore; I do a perfunctory check on an ancient machine to see if the page is readable, put a “Get Firefox” button on it if IE6 is detected, and don’t pursue things any further. The only reason I check at all is to see what the problem is and either fix it (sometimes, very rarely, it’s an actual coding problem, but not often) or simply note what the problem is so if anyone emails describing the symptoms I can write back and tell them to get a real browser. This latter, however, hasn’t happened in several years. Probably because fewer and fewer people are using IE6, and those that remain are used to their web browsing being a disaster.

It is also increasingly commonplace when using IE6 to find pages bearing warnings that your browser is obsolete and will not be supported for much longer, along with links to download sites for browsers that actually work.