This has been kicking around for the last week, but I'm still looking forward to it: NASA and Internet Archive are partnering to digitize and make freely available 50 years of NASA photographs, historic film and video.
The sheer amount of data must be staggering. I can easily see this as being one of the most interesting websites on the internet, but at the same time, it can also be the most boring. Hopefully it will be heavily annotated and have a great search function, so people can find and make sense of what's there.
A few links about this: