I agree that spreadsheets are not optimal for reading tons of info, but I think they are easier than wikis for writing most stuff: Concurrent live editing w/out fear, no manual markup formatting, no Edit button, no Submit step... I think that was one of the points of the other thread (about the overnight book): that Google Docs and Spreadsheets are enabling some collaborative works that would have otherwise been more painful to create.

That said, Google supports lots of input + output formats. I hope you're right and somebody is hacking some cool stuff together.

edit: your proposed structure sounds really cool to me.