For lack of a de.licio.us or reddit function on d.o, here's a set of useful links related to what we could or should do with open data:
Making the Business Case
2011-03-12: NYTimes: This Data Isn’t Dull. It Improves Lives.
https://www.nytimes.com/2011/03/13/business/13view.html
Tools
2011-02-17: Google Public Data Explorer goes public
http://radar.oreilly.com/2011/02/google-data-explorer.html