Hi sillywabbit
To my knowledge, there is only one book out so far on
Captivate 2. Essentials of Adobe Captivate 2 by Kevin Siegel.
Click
Here if you would like to visit a page where you may order it.
I recently met Brenda Huettner in Vancouver at the DocTrain
UX conference. She expressed that she might be considering a second
book. But that's just hearsay at this point.
Cheers... Rick