The Web Standards Project have written an open letter to Microsoft,
asking them to deliver deliver 100% support for CSS, HTML 4, DOM Level 1.0 and
XML 1.0 in the next version of Internet Explorer. From the letter:

Full support of these standards will enable
developers and designers to
finally embrace this technology,
which Microsoft helped create, and
which Microsoft was the first to begin
supporting. Less than full support in
Internet Explorer would be a bad
marketing decision when its largest
competitor delivers the goods.