Oooh, PictPress looks nice but I’ll have to put some restrictions on usage here as convert is such a dog on any system! Hmm, it’ll need some sort of upload facility in the backend too as it’s impossible to create directories in the images folder right now.
If you’re looking for a photo gallery, you might try out a super simple one I just created: http://blog.perfectspace.com/2006/03/28/duh-gallery-the-simple-wordpress-photo-gallery-plugin/