http://events.linuxfoundation.org/slides/2010/linuxcon2010_wheeler.pdf PDF slides that show what happens if you create a file system with one billion (10**9 ) files
http://www.slideshare.net/padday/the-real-life-social-network-v2 A great presentation [from google] about how people interact socially in the real life and how current social networks represent them. (Needs about 30 min to read)
http://www.pgcon.org/2010/schedule/events/219.en.html http://www.pgcon.org/2010/schedule/attachments/141_PostgreSQL-and-NoSQL.pdf
http://media.ccc.de/browse/congress/2009/index.html Video archive for Chaos Communications Congress 2009 (CCC - a well-knows security conference )
http://vimeo.com/channels/postgres#7707230 collections of videos of PostgreSQL-related presentation from Vimeo.com
http://blog.carolynworks.com/?p=154 good wrote-up about usefulness of power point (which I hate with a passion)