Unfortunately, the release notes are enormous docs.

Fortunatley, each reflects a huge number of new features, bugfixes and enhancements.

Off top of my head:

- continuing work on tools like Dialyzer, McErlang, quickCheck

http://erlangotp.com/wiki/analysis/

- new SSL module

- NIF's

- Ericsson puts the repo onto github, starts pulling patches

- "erl +native" / HiPE

- schedulers for SMP processing

- large shared data structures passed as messages:

- from Basho: riak, rebar and Nitrogen

- Oreilly and Manning books (Cesarini/Thompson an outstanding book; archaelus and Gerakines were writing books also,hope they get published)

- learn you a erlang, erldocs.com,

http://learnyousomeerlang.com/

http://erldocs.com/

- the community has not changed. Beginner questions are still enthusiastically answered on IRC, the google group and stackoverflow (by Armstrong, Virding and the Ericsson core team, among others)