Five Simple Steps has videos available from their Responsive Day Out. The lineup looks good, and the talks are relatively brief. So far I’ve only watched Solving problems with selectors by Heydon Pickering. The talk was entertaining and a nice introduction to his way of thinking, but you’ll really get more out of his longer talks, such as Effortless Style or Getting nowhere with CSS best practices.
Having never been a fan of grid systems, I like the way he reclassifies them as “grid prescriptions.” A grid is a great design tool, but let’s not let it dictate our markup.