Jon is right of course.
Dynamic langauges will be a key part of the mix of any self-respecting technology "stack" going forward and Python makes is a darned good, mature, cover-all-the-bases candidate.
Jon describes IronPython as 'compelling'. I agree. It is shockingly good.
As the laws of random chance would have it, Beta 1 of Jython 2.2 has just been announced by Frank Wierzbicki.