"Aikido Talks: Conversations with American Aikidoists" by Susan Perry and Ronald Rubin. I also just reread "Kodokan Judo" by Kano yet again. Always seem to find something new with that book.
I must say I am a huge fan of Mr. Lowry's work, and this one is very good.
My favorite of all his books is still Autumn Lightning, but that was because of the format and it tells his story. Persimmon Wind followed in a similar venue.
I've been slowly working my way through Martial Musings - Robert Smith. Basically I balance that with a fiction book, which works perfectly thanks to the anecdotal set up of Musings.
I'm currently reading "Taekwondo: Ancient Wisdom for the Modern Warrior." by Doug Cook.
I'm about half way through and I'm really enjoying it. It talks about history, philosophy of the MA's, meditation etc. It's really making me ancious to switch to a different school which will hopefully take more of these aspects into account. Unfortunatley I still have about 8 months before I move. Getting ancious now isn't doing much good but it's also helping me practice more and stuff.
Currently reading: This is Self-Defense (Kenpo Jujitsu) by Frank R. Ricardo. Good information, most experienced martial artists should have this material assuming that they approach their martial art as a concept rather than being technique oriented.
"Martial Arts After 40". The good part of this book - I know I am not alone. Unfortunately it hasn't offered much I didn't already know, but won't admit.
This is the 2nd time that I have worked through MacYoung's books. Like everything, there is good info there but you do not necessarily retain it all. His writing style is unique and may set some people off, but I focus on the info, not the style.