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Leonard Lin put together an excellent list of the presentations at Web 2.0 Expo, complete with links to slides and video when available. All of the presentations are worth checking out, but I wanted to point out the ones on the list from Yahoo (not all slides are available yet -- we will add to the list as they become available):

A Flickr approach to Making Sense of the World, from Rev Dan Catt of Flickr

Capacity Planning for Web Operations, from John Allspaw of Flickr

Grasping Social Patterns, from Christian Crumlish of Yahoo! Developer Network (from Ignite SF)

Tagging: Opportunities and Challenges of Scale, from Kakul Srivastava of Flickr

Also, be sure to check out CTO Ari Balogh's keynote in which he introduces Y!OS (the Yahoo! Open Strategy) and Neal Sample's deep-dive into Y!OS.

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