"If you're running Windows Vista RC1 and you notice that the nice Glassy Aero UI keeps switching into "Basic Mode" every time you visit a website with some Java on the page, you should upgrade to the Beta of the Java Runtime Environment (JRE) 6 Beta 2 (second link on the page) as it supports staying in Aero mode while running Java Applets."
http://www.hanselman.com/blog/SunsJa...cUIScheme.aspx
EDIT: Firefox and Azureus dont recognise JRE 6 as a valid JRE under x64. Word on the street is that it works fine on x86.