I thought this was a re-post of his "Raw Data Now" talk, but instead it's actually a follow up. Especially interesting is the Open Street Map demo, especially for Haiti before and after the recent earthquake. (Then my browser locked up with about a minute to go.)
Drupal is becoming an important player here because RDFa is now baked in. Both the US and UK government data sites run on Drupal (as does Tim's own site).