Thought this may help others trying out the new IE version.
Forgot to add ... still displays correctly in Firefox 1.5. I have not tested in other browsers though./* IE Hack, will cause the css to not validate */
#primary-nav li, #primary-nav li.menuparenth { _float: left; height: 1%;}
#primary-nav li.menuparenth {float: left;}
#primary-nav li a { height: 1%;}