My talk on Yesod at QCon SF was just posted by InfoQ, hope you enjoy!

Also, I've started to revise the book based on some reviewer feedback. I've added in an extra chapter covering some of the Haskell features we use in Yesod, such as Template Haskell, as well as revised the basics chapter to demystify some of the magic that the code generation is performing. I'd appreciate people's thoughts on this move.