Babylon 5 Interview Books
I don't know how many of you B5 fans know about these (I would suspect most) but I only remembered the other day, and saw on their Cafepress page that they won't be selling them anymore (you have 24 days to buy.) I just got my set today, and they are fine collections of interviews and other behind-the-scenes info, sketches, photos, and so forth.
There's also a series of books for Crusade that haven't completed production and will be offered until completion.
Here's their Cafepress page: http://www.cafepress.com/b5books
They are expensive, but I think that's partly because they're limited editions, they're signed by the various (still living) primary actors, and come with CDs of recorded interviews.
It's going to take me a while to read them (slowish reader) but I've already read one with Ed Wasser, and it was a well-done interview 
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I've got the books now, and one thing that's "sad" is that they keep referring to the "Babylon 5 Script Books", up to volume 12. When I went looking for those, some were out of print and thus hundreds of dollars each. I guess I'll just have to be content to not worry about ever reading those.
I read the interview last night for Michael Ansara and have begun the book on Crusade, titled "What the hell happened?"