If I could change one thing about the NOVA archive, just add a little design to it. I would also find a way to market it more so that more people can contribute to it.
One digital history archive that I have been associated with was the Gaskin archives on ancestry.com. The strengths are that there are so many people contributing antique documents to the archive. The weakness is that me and my father are the only ones transcribing and Digitalizing the information.