Microsoft just released a new website to showcase and organize plugins for its Windows Live applications. It includes plug-ins for Photo Gallery, Movie Maker and Writer.
Photo Gallery plugins include, Inkubook (for creating professional looking photobooks), various uploaders (Facebook, Picasa, and Youtube) and other publishers for content management systems.
Movie Maker plugins are currently a little more limited, with only uploaders for Youtube, Facebook and Smugmug.
Live Writer users should be excited as there are over 177 different plugins available, running the gamut from content enriching tools (Now Playing, Polaroid Picture and more) to specific object inserts like Youtube videos, code inserts, smilies, attachments and more.