The recordings of the talks are getting posted online.  Here are a few that I went to that I personally think are worth your time. I will probably make a few of these posts so you can use the tag devconTalks to view them.

Here we go:

The latest on Ethereum with Vitalik Buterin.

Cryptoeconomics at Scale by Karl Floersch

Decentralize, Democratize, or Die by Cory Doctorow

You can also skip my recommendations a just go to the source on Slideslive:

Have fun,