Linda Sandvik's talk about "Making Things Better" was a really touching talk. It started slowly and I thought it wasn't going to be good but it just got better and better over time: http://vimeo.com/53074443

Mandatory plug for the HNLondon Vimeo page: http://vimeo.com/hnlondon

A collection of all our previous speakers including jgc (obviously) Eben Upton, Rand Fishkin, Joel Spolsky and many more.