With many thanks to the people who contributed for this release: Andrew Davey, Avishay Lavie, Cedric Vivier, Chris Prinos, Doug Holton, Jim Lewis and Max Bolingbroke.
What? - http://boo.codehaus.org/
Download - http://boo.codehaus.org/Download
Official irc channel - irc://irc.codehaus.org/boo
Highlights for this release include dramatic improvements to dynamic dispatching performance, a friendlier DSL syntax and of course bug fixes. This is also the last release to support .net 1.1.
Full change log here.