It looks like Natalie's presentation at BarCamp London 5 was excellent.
Gavin Bell has posted the slides from his excellent talk at BarCamp London 2.
Ben's thoughts on RDF and microformats, prompted by last weekend's BarCamp shenanigans.
I got roped into this face-off at BarCamp London 2. Here's a video of the ensuing confrontation. This was a lot of fun.