While I enjoyed the vast majority of talks, I felt that some didn't hit their mark. A select few speakers were poorly prepared for a conference that they had months to prepare for. One speaker made a comment along the lines of "I would give a demo, but I ran out of time to prepare." Another speaker (verbatim): "I've been working on this talk since yesterday. ... If it looks like I don't know what the next slide is, it's because I don't." There were also 4 talks about the history of go. Three of those talks were given by people that all work closely together. I would have expected to see a higher level of polish in both speaker selection, and preparation by the speakers.
That said, talks I suggest watching:
Simplicity And Go -- This talk is a great counterpoint to everyone that says everything you need is in the stdlib.
Delve Into Go -- A great technical talk about the challenges that golang has with debuggers.
Go GC: Solving the Latency Problem -- Technical talk about the GC changes coming to 1.5.
The many faces of struct tags -- Food for thought on how you can better make use of struct tags. Russ Cox loved the expanded uses.