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.