There are many books out there, and online chat/posting sites, although I haven't been to any of them or looked into the subject that much in quite a few years. I like to read those that believe and also those that debunk. If you turn up anything from Peter Lemusierier (not exactly sure of the spelling of the last name, but it's close), he neither debunks nor supports Nostradamus, but is French and has a really good knowledge of the language from back in the days when Nosty lived.

If you like that kind of stuff, you might want to do a search for Lobsang Rampa. The first site that should come up is the result for his .org site. (Not the wiki, although it has some history (quite brief) of him.)

He wrote many books, but "The Third Eye" is the most well known in metaphysical circles. It isn't like exactly like Nostradamus, but if you have that interest, you may like it, and a few subjects do intersect.

The good thing is that you don't have to read all of his books (although I did), the site is a pretty good collection of those things he wrote about. If you don't have the interest, look up Peter L from above, though. His work is the best I have seen.