I am so embarrased I had emails flying back and forth with a couple of people who were working on this script and this was the version I liked best. I hope the person who put it together lays claim to his work! You can download the script here: http://isabelcutler.com/EXIFcameraname.pspscript
Place the file in the PSP Scripts-Trusted directory. ( I can't explain why the EXIF below reads 10.9 for the focal length and the script says 17...maybe that reference can be edited out of the script.)