Wow, this is pretty nifty: NASA is looking into going open source for a lot of their software. Of particular interest is their World Wind software, which is a "Google Earth"-type app, and is very cool. I love things like this: a highly-skilled and well-funded group can put together an amazing engine for software, and by making it open source they can have legions of people adding their own stuff to it. Google Earth has lots of add-ons (or plugins or whatever you want to call them) which make it an extremely versatile and fun piece of software. I expect NASA can do pretty well here too!