This screencast explores who you can work with new dynamic objects in .net 4.0 and IronPython
the video covers these topics:
Video: http://vimeo.com/12722910
Source Code: http://cid-19ec39cb500669d8.office.live.com/self.aspx/Public/Blog%20Posts/2010/DemoIronPythonDynamicInterop-^52010-06-21^6.zip