Nand Romijn in a message on dpreview accepted my challenge to edit the PSP EXIF info script to also include the ISO and focal length. His message here, gives a link to the script: http://forums.dpreview.com/forums/read.asp?forum=1009&message=12819913
By the way, the same script works for images created by Sony, Canon and Olympus cameras. Those were the only cameras I could test.