Java Tech Journal April 2012 on GPars, parallel collections, asynchronous functions and dataflow concurrency (by Vaclav Pech)
Groovy in Action, 2nd Edition chapter 17 (available in MEAP) covers the basics of GPars.
Wrote or spoke about GPars
jaxenter April 2012 on GPars, parallel collections, asynchronous functions and dataflow concurrency (by Vaclav Pech)
JVM Concurrency and Actors with GPars article at Dr.Dobb’s
Flowing With the Data — Vaclav Pech
Testing Asynchronous Code with GPars Dataflows by Hamlet D’Arcy