Beta 2 is now available for XP SP2, Windows 2003 Server SP1 and x64 editions. http://blogs.msdn.com/ie/archive/2006/04/24/582546.aspx has details.
If you thought you already had beta 2 then you probably had a preview of beta 2. This is the real beta 2 build. Please continue to give feedback so we can prioritise the work for final release see http://blogs.msdn.com/ie/archive/2006/04/24/582542.aspx for details on feedback and support.
Watch the IE team blog at http://blogs.msdn.com/ie for progress on IE.
It's great to hit this milestone. Lots more work to do yet.