Here is an excerpt from the main site : http://www.blendables.com/labs/Desklighter/Default.aspx
Why do I need Desklighter?
The idea of taking the Silverlight application off the web into a portable single file executable opens up a whole new playing field.
You can share your Silverlight applications without having to worry about the hosting infrastructure.
With Desklighter you can carry your favorite Silverlight content from the web and share with colleagues who are not connected to internet.
Distribute your Silverlight content on USB flash drives or in CDs where ever and to whomever you want. The possibilities are endless.
You can of course distribute like that your IronPython Silverlight application :-)