It seems that Learning WordPress was launched only a few days ago, but it’s really worth checking out. It is (potentially) a well organized database of WordPress plugins. There are main plugin categories, with subcategories listed underneath. Since this is a really new site, many of the categories have nothing listed under them yet. The goal seems to be to make this a community site where registered users can submit plugins to be added to the database. It has a lot of potential, and if people start submitting plugins, in a month or two this site could really be useful. And I think that the design is noteworthy.
The site’s name, “Learning WordPress,” seems to indicate that the site will be about WordPress in general, and not just about plugins. Will this guy/gal be adding more topics in the future?