My editor has informed me that ‘Christ our Captain’: An Introduction to Huldrych Zwingli (Quartz Hill Publishing, 2011) is available!
I’m really quite pleased with this one and if you have any interest at all in Zwingli might I encourage you to get a copy?
I think you’ll like it. Peter Opitz, at the University of Zurich does. And he knows the Reformation and the Reformers!