Sharp designer Raheel Waqar passes along a nice write up on Creative Thinking from Interbrand here. The article has a few nuggets on brand focused approach to solution development, but it does come across as a pamphlet for Interbrand marketing.
I always refer to Edward De Bono when it comes to "thinking" based ideation, conceptualization moving into analysis and realization of a solution. See De Bono books on the subject here.