Microsoft has discontinued support for IronPython.

The IronPython community's strongest members are the new coordinators, and IPy is under the Apache 2 license.

http://blogs.msdn.com/b/jasonz/archive/2010/10/21/new-components-and-contributors-for-ironpython-and-ironruby.aspx

My take on it here: http://blog.prosysplus.com/2010/10/ironpython-is-dead-long-live-ironpython.html

Hank