Screenwriting instruction

My history of screenwriting books goes this way:

• In 1997 I introduced my electronic screenwriting tutorial Screenwright, which is still the best product I have in this area.
• In order to use this in class, I adapted a linear book from the material with the same title. This was introduced in 1999.
• In 2003 I expanded Screenwright into a new paperback called What Happens Next?, primarily updating the examples.
• I was contacted by Focus Publishing to do a screenwriting textbook based on my work. This became Practical Screenwriting in 2005.
• Now I am reworking What Happens Next? for Smashwords.. Not sure what I'll call it. Or charge for it. I'll try to get this together sooner rather than later, surely my last contribution to screenwriting literature.