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.
ailStat is a real-time web site statistics package which uses Ruby on Rails web application framework. It is based on ShortStat and Pathstats packages.
Oberkampf is a set of a php tools that will allow you to paste certain functions into your files that result in some form of flickr result and display.