Forgot to mention in the last update that the HP 2133 Mini Note video works correctly (in 2D) with the openchrome drivers which come with Ubuntu 9.04 (Jaunty Jackalope). No special xorg.conf needed.
I run my HDTV as a second monitor whenever I need something bigger to look at and openchrome does work with the Mini Note’s VGA out but only in single screen mode and the cursor will go missing, so you need to use a software cursor.
To do this open up your xorg.conf and add
Option "SWCursor" "true"
to the Device section.