Ah, IE6. I can imagine that conversations like the following will take place even 50 years from now:
“Well son, back in my days there was a browser called ie6 and people refused to give up using it. Web was a different place using this browser. It was like entering a museum of modern art. Everything looked random and abstract, user experience that companies invested millions was optional for this browser but millions of people were still using it. It was like a drug. Because people knew there were better alternatives but they couldn’t take the step.”

Back to reality now, Six Revisions released an excellent guide to “taming the ie6 beast“. Conditional stylesheets, hacks, the box model and all these stuff that need extra care and probably an extra timeline only for IE6.