Erik Meijer explains the various aspects needed to categorise data stores, how reactive programming fits in with databases, the return to data transformation, denotational semantics, and much more.
Damian Conway explains where Perl 5.x is used today and why (hint: the CPAN library repository), and what Perl 6 offers: modern OOP, an optional type system, libraries for parallelism and concurrency, and very powerful built-in tools for parsing including extensible grammars.
Stefan Tilkov explains the importance of Hypermedia in REST and how to use it, ROCA (Resource oriented client architecture), WebSockets vs polling or server sent events, and much more.
Laurent Sansonetti explains using Ruby for iOS development with RubyMotion, how Garbage Collection works in RubyMotion, the library ecosystem, the state of debugging and profiling, and much more.
Brian LeRoux talks about the PhoneGap Build service, mobile web apps vs native, Facebook's switch to a native iOS app, PhoneGap adoption in emerging markets, Firefox OS, Adobe's web tools and more.
Stephanie Kaiser explains how metrics driven design is used to develop and continuously improve games at wooga, how the company uses A/B testing and usability testing and much more.
Stuart Halloway explains Datomic, programming transactional behavior with Datomic, Datalog and logic programming, programming with values, Clojure Reducers and much more.
Graham Lee discusses how to design and write secure (mobile) applications, the concept of sandboxing in general and on OS X, Objective-C and Smalltalk, and much more.
Brian Rasmussen explains Project Roslyn: accessing information about a code base, creating static analysis tools, building REPLs and other scripting tools with Roslyn, VS integration and much more.