I believe some of the problems stem from a mass cleanup they've been doing of their public domain titles. [More on that here]
I'm assuming for now that these problems are temporary. It happens, especially when a major service has to remove thousands of files at a time.
Sadly, the vast majority of my readers are Blackberry owners and Mobipocket regulars, which would normally leave me in a very awkward position. Not this time.
This time I'm prepared. If you have Mobipocket Reader you can still get my books at Smashwords DRM free. They even have work there that isn't available anywhere else, like the Strange Horizons and Close Encounters Living Anthology.
There's better news. Until September 21 my books will be available for $3.95 or less at Smashwords, some will even be free. Why? It's simple: I realize some people are panicking about their Mobipocket bookshelves going away, and I'd rather you didn't. This is also a good opportunity to tell your friends about the series. Smashwords has all my books in every eBook format you could imagine. The First Light Chronicles Omnibus is now free.
The above sale isn't a sign that Amazon is shutting Mobipocket down, in fact, I don't know what's going on over there. It could just be a public domain duplicate cleanup. I hope Mobipocket will be around forever, but I'd rather play it safe.
Thank you very much for being loyal readers, I'll do everything I can to ensure that my work remains available at reasonable prices. I'll update this post when Mobipocket reappears.
[UPDATE: Mobipocket is up again after two hours of downtime (by my rough estimation). The notification that they're still working on eliminating poor quality PD books is still up. My migration sale will continue.]