With Internet Explorer 8 Beta 1 for Developers now out in the wild, we have received a good deal of positive feedback regarding our plans for CSS. The feedback includes the need for the specifics around CSS support for IE8 Standards Mode for both the current Beta and what is projected for the final release. This information allows you, the developer community, to test your sites and give quality feedback for features that are actually implemented in the current beta release. These details are posted up on MSDN in the following document: CSS Compatibility and Internet Explorer.
Once again, we thank you for your support and passion for building great products.
Principal Program Manager Lead
Internet Explorer Developer Experience Team