I have thought about rolling the gallery into a plugin but with all of the other galleries out there, I figured it would probably be a ton of work that would get lost in the crowd.
There are a lot of WP users who are waiting (and waiting) for a gallery plug-in that allows custom cropping for thumbs (like what Gallery2 uses) easy resizing of images and thumbs, multi-file uploads, and even metadata, but keeps everything in WP (meaning, not a Flickr or Gallery2 plug-in). If you can roll that, you’ll be a popular fellow and won’t get lost in the crowd.
Your site looks great. Nice.