Fact: most applications are built by combining existing applications and/or existing libraries of code.
Fact: a critical component of programmer productivity is the ability to re-use existing knowledge as well as existing code.
Fact: programming languages - especially general purpose programming languages - are examples of re-usable knowledge.
Having a "glue language" that you can use everywhere you work now and everywhere you might work in the future, from Linux to Windows to Mac to JVM to .NET to System 390 mainframe to Mobile Phone is a honkingly good idea.
Suggestion: A glue language that flows around all your existing libraries and integrates seamlessly with the feature of the local platform is a very, very desirable attribute of a glue language.
Fact: Python (or CPython if you like) runs... well, everywhere.
Fact: Jython does a stunningly good job of seamlessly integrating with the JVM platform.
Fact: Python is becoming so pervasive and so well known that it is now bordering on the (gasp) "safe" categorisation for even the most conservative enterprise application development.
(Newsflash: Python has been a completely safe bet for years now but it has taken time for the news to trickle all the way up.)
Fact: IronPython is now at version 1.0. .NET fans of my acquaintance say it features fall-off-your-chair-type excellence.
I'll leave that up to you.