Thank you for the great plugin! I was trying to find out how to contact you and ask you if you're interested in having some help with developing the NextGEN Gallery plugin. There's a handful of improvements I noticed could be made such as more action/filter hooks that I'd be glad to contribute instead of making a fork from the plugin, which I'd rather not do, if you're interested.
I was also curious about a couple of other things, such as why not use a custom post type for the images and post meta to store the additional properties for the images compared to creating 3 new tables just for the plugin? I appreciate the separation of the images from the Media section, leaving that for "site-specific" supporting files and so on instead of full photo galleries that would clutter it.
The reason I ask is I am writing a theme that I want to center around this plugin and need things such as tags for images, but the taxonomy pertains only to posts and not to custom table data, so naturally there's a dilemma there. It's also counter-productive to create a new post for each image since WordPress natively treats uploaded images as posts but with a different post type.
Since I'm going through the NextGEN Gallery plugin's code, I was wondering if I could help improve it or at least pick your brain on a couple of things since I'm sure there's reasons you did many of them that I may just not see.