Andy Payne has released a new Firefly Build (1.0067) which is compatible with the latest version of Grasshopper (0.9.0006).  This release has a lot of new features for Arduino experiments. A detailed list of new features if available in the ReadMe text file included in the download.

Andy has also been hard at work on a new Firefly User's Guide (called Interactive Prototyping).  This manual is still a work-in-progress but it is intended to teach the basics of electronics (using an Arduino) as well as various digital/physical prototyping techniques to people new to the field.

For more information, visit the all new Firefly website at: http://fireflyexperiments.com/