Submission + - Boo 0.9 released! (codehaus.org)
This is the biggest release ever, with many improvements all across the board, and lot of new features including: generator macros (ie. yield new code blocks dynamically), nestable macros (handy to create DSLs), generic parameter constraints, a strict mode that enforce more conservative defaults and checks, string interpolation formatting, and last but not least (well...maybe least actually;) Silverlight support.
Grab it while it's hot! Feel free to join the mailing-list for questions and latest updates on Boo development."