Hi Jeff,
Although I am not a regular PS/FDR-PI user I have been playing with it to learn the new processing and post-processing controls in *eager* anticipation of the completion of the FDRTools version (sometime in 2010??).
As soon as the plug-in is out I will port the new tone mapping stuff to FDRTools. This will then be v2.4.0. It is not too hard but nevertheless no chance to finish it in 2009

The PI works fine for me (Windows XP & CS3), however I would find very useful a full screen toggle on the PI window within PS (or better yet the 3 standard windows buttons in the upper right corner). Any problems?
Good question. I know that there is a Maximize button in the OS X version. Maybe an oddity of the GUI toolkit I use. Will check it.