I've known about the DL series for awhile, but I've only really gotten into the series recently. I only own Chronicles and the first Preludes trilogy (there aren't many good bookstores near me sadly). However I've 'acquired' a few of the others. According to the DL wikipedia page there's around 200 books based in the universe. And, so far I am quite enjoying the series, I'm on Dragons of Spring Dawning now.