I saw the book "Everything You Know About CSS is Wrong!" on O'Reilly Safari today. The books description and table of contents indicate that IE8 is a big thing for CSS so I decided to try it. You can learn about IE8 and get IE8 Beta2 at http://www.microsoft.com/windows/internet-explorer/beta/default.aspx

One new feature you need to use is the compatibility button. It the philosophy of IE8 is to be as standards compliant as possible. However, there are many websites out there that are not standards compliant. They function and appear as they should in older browsers, but do not in a standards compliant browser. (Assuming Microsoft got it correct which they usually do eventually.) Anyway, the Compatibility View button lets you choose between the standard compliant view and an IE7 compatible view. I've already run across several sites where I've needed to switch to the compatible view. http://blogs.msdn.com/ie/archive/2008/03/03/microsoft-s-interoperability-principles-and-ie8.aspx has some good information on this topic.