Here is a short video of the "Plus" version of "Flak Cannon" from the "Essential Guide To Flah Games Book". I have taken the game beyond the scope of the book. A free tutorial will be available later this year that describes how to take the game described in the book and enhance to it make this game. In the meantime it will go out "virally" self-sponsored by the book.
The book now has a release date of March 12, 2010. Since were in final final minor text revisions, it seems like this date is firm.