Have you tried the latest Internet Explorer 8.0 which was officially released yesterday?
If you have not, then please don't!!!
It's got lots of bugs. Many web pages that used to work on the IE 8 RC (release-candidate) version are not loadable by the IE 8 official release version.
Of course, such hiccups are expected. But under such market competitions, one would expect Microsoft to be smart and nimble with its execution. Again, I am disappointed.