Parrot release timeline
March 2009 - Parrot 1.0 (language implementors' release)
July 2009 - Parrot 1.5 (integrate, language interop, embed)
January 2010 - Parrot 2.0 (production-ready)
July 2010 - Parrot 2.5 (portability)
January 2011 - Parrot 3.0 (independence)