Notes and presentations from the href="http://www.jvmlangsummit.com">JVM language summit 2009 are available. (Even though the page says 2008).

Most intersting talk seems to be from Rich Hickey's clojure presentation where he wants languages to be explicit about time.

Presentation[PDF]

Conclusion of his talk: [Youtube Video]. Followup comment from John Rose @ Sun

Also Erik Meijer talks about .NET Reactive Framework. Calls GOF book crap [YouTube video].

Archive of Live Tweets

Choice quotes:

"If you want to get rid of the clojure parenthesis' you have not experienced them enough" - Rich Hickey

"Mock objects and dependency injection are just for people who don't know math" - Erik Meijer