What Sean said. After a lot of hard work in community building and a lot of development, Jython 2.2a1 is available for download. It's the first major release since 2001. Don't let the minor version number fool you. The jump from 2.1 to 2.2 is big: new-style classes, generators, and collections integration are significant changes - Jython just got a whole lot better. From the release notes: "This release includes many major changes since the last full release: - new-style classes - Java Collections integration - PEP 302 implementation - iterators - generators - __future__ division - support for running on JDK1.5 - new installer - a significant number of features to bring Jython in line with CPython - many, many bugfixes" As I understand it, there'll be alpha and beta cycles before 2.2 is released. Anyone using Jython 2.1 should keep an eye on the releases. - I imagine 2.2 will be arriving some time this year, and you'll definitely want to upgrade to get the new language features and fixes....