Prism is a very interesting little development that the Mozilla folks are working on. Don’t recall where I read about it – probably slashdot. The nub:
Prism is an application that lets users split web applications out of their browser and run them directly on their desktop.
With an illustration that neatly captures the reason for the name and functionality:


[…] ordered an affiliate of Google to disclose that information? Or in the near future when things like Prism get to a point where users aren’t even sure whether their data is here, there, or elsewhere. […]