Just finished S.M. Stirling's Conquistador
This book is about parallel universe. I won't spoil the plot, but it's a damn good read. Very original with the premises and the details are spectacular. This Stirling dude really knows the layout of California, and the funny way Mid-West people talk (I'm in Minnesota right now and I can guarantee that they talk funny up here just like in the book).
His military lingo is pretty down pat as well.
Can you dig it?