Debasish Gosh talks about Domain Specific Languages: how to build DSLs with Scala or XText, real world DSLs, parser combinators and monads. Also: how Akka brings actor-based programming to the JVM.
Rob Pike discusses Google Go: OOP programming without classes, Go interfaces, Concurrency with Goroutines and Channels, and the Go features that help keep GC pauses short.
Rob Pike discusses concurrency in programming languages: CSP, channels, the role of coroutines, Plan 9, MapReduce and Sawzall, processes vs threads in Unix, and more programming language history.
Cliff Click discusses the Pauseless GC algorithm and how Azul's Zing implements it on plain x86 CPUs. Also: what keeps dynamic languages slow on the JVM, invokedynamic, concurrency and much more.
Venkat Subramaniam talks about the characteristics of JVM languages like Groovy, JRuby and Scala, and their applicability in enterprise applications. He also mentions several implementation details and finishes by addressing issues of lifelong learning for developers.
Dean Wampler discusses the state of Scala: the big changes in 2.8, the Scala on .NET, concurrency and parallelism with Scala and Akka, and experiences with adoption of functional languages.
Paul King discusses the state of Groovy and its maturing ecosystem which includes IDE support, static analysis tools, testing frameworks and the GPars library for concurrency.
Emil Eifrem explains graph databases, what domains they fit well, and the state of Neo4j. Also: how graph databases stack up against RDBMs.
Rich Hickey explains the ideas behind Clojure 1.2's new polymorphism constructs deftype and protocols. Also: Clojure 1.3 features such as faster arithmetic and future features like Pods.
Yehuda Katz talks on how Rails 3.0 has been received by the community, what are the differences compared to other similar frameworks, the impact of having different Ruby implementations, and what’s coming in Rails 3.1.
Mariano Guerra talks about Efene, a new language that targets the Erlang VM, which attempts to provide nicer syntax than Erlang.