I've been adding to my library of suitable reference material, scenarios and rules ... I had the ECW siege scenario booklet and I got the other ones; lots of scenario ideas for planning future games.
A while back I obtained the Fire & Sword rule book and other publications..
very handy reference background material and information on army compositions. The rule book is handy, but my own rules seem to cover everything, so I'll stay with mine.
Also I've been perusing ...
a great read, lots of info on armies of the The Deluge and some nice illustrations.