Some of these I know your working on or I have told you over IM but figured Id post them here as well.
* Addition of "Views" for each gallery catagory. To see a total number of views for that specific catagory on the galleryhome.
* If the same user uploads a picture named 001 in Catagory A and then uploads a picture with the same name of 001 in Catagory B. When the user uploads the second picture it renames it in the image input field. Catagory B image that one has named in photoshop will then be renamed to 001_548763. But for sites that keep a 001-999 picture name you have to go in and manually delete the "_548763" that is added.
* Rounded thumbnails with a 1pixel border / dropshadow. I know you were messing with this idea.
I know I told you others but cant think of them right now.