Reading lists are OPML documents that point to RSS feeds, like most of the OPML documents you find, but instead of subscribing to each feed in the document, the reader or aggregator subscribes to the OPML document itself.
DiSo (dee • zoh) is a new umbrella project for various open source social networking components that we’re working on. In the beginning, we’re largely targetting Wordpress, building on the work Will Norris‘ has done with his excellent WP-OpenID plugin