I second swanny's suggestion and as I mentioned, templates need to be simple.
I would like to see photopost supporting and using TAG system like all modern galleries, websites and CMSes use today. So, if you take a picture about "aircraft" it should pull all pictures tagged with that keyword (regardless of the
category).
I would also like to see enhanced RSS feed support. I know, rss feeds for categories was added, it needs to go step further and have support for feeds based on tags.
The "LATEST" shows last 4 or whatever # of pictures uploaded... there should be an option to change that to last 4 or whatever # of
CATEGORIES which were updated so the pictures shown in the "LATEST" area are from different categories and not just one... same goes for the rss feeds, latest galleries updated, not last 50 pictures from ONE category. We had to get that custom coded!
Also, the admin controls when viewing medium image are little out of place. Admin/mod/user controls should be shown around, near the picture for that user.
Improve error notification and detection...
for example: If a picture being uploaded is too small, the script should just delete that and continue with the rest of the uploads!!! Right now, this is really broken as PP detects picture size is too small, it stops with a dumb error and no information about which file is causing the error or which file is too small so the user can at least go back and delete/uncheck that in the bulk upload page.
Some design inspirations with jquery/ajax
30 Trendy AJAX, jQuery And Image Galleries You May Like jQuery Image Galleries & Sliders – Best Of