From wp-grain

Yet Another Photoblog

Yet Another Photoblog, or Yapb in short, is a WordPress plugin created by Johannes Jarolim. It extends WordPress with image handling functionality and basically converts your WordPress installation to a photoblog engine like Pixelpost.

You can find Yapb at wordpress.org or on Johannes' blog, by following this link.
There's also a forum/board for Yapb which you can find here.