I think its more fun to read them in order and right after another because I read so many books that if I wait a year inbetween each one I dont remember some of the "inside info" as if you were reading one after another. If they are semi-stand alone with some related charactors it doesnt matter too much. Hopefully with all the ebooks maybe it would not be such a big deal if the publisher did not want to print the rest of the series at least put it on ebook.