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.
Adobe AIR app that lets you display items in your RSS feeds in a scrolling ticker on any edge of your screen. Not for the faint of heart or the information averse.
PostRank claims to measure social engagement, including blog posts responding to someone else, bookmarking an article, leaving a comment on a blog, or clicking a link to read a news item.