Converts an rss feed into an image linked to the original feed that can be displayed on any web page (including WordPress.com). No need for RSS parsers.
Though it may seem like everything has an RSS feed nowadays, lots of sites still lack the feature. Fortunately, there's Dapper: The Data Mapper, a web service that will take information from a site and package it in the form of your choice.
APML allows users to share their own personal Attention Profile in much the same way that OPML allows the exchange of reading lists between News Readers.
Tagging online content is something that doesn't seem to have taken off the way some people expected it to. Is it too complicated for widespread adoption?