One of the reasons I find SOLO such a useful framework is that it allows me to provide content related feedback to students, as well as "feedforward" (thanks @CHarte) to students. This helps develop student thinking and the quality of student work. I hope these examples illustrate how obvious the next steps in subsequent pieces of work are for these students. I find it a happy blend of specific and generic that makes it accessible to students.
My interest in the idea of sharing pedagogical purposes comes directly with the contact I have had with the Project for Enhancing Effective Learning at Monash University in Australia. Now each of these teachers were very active in establishing learning agendas with their classes. The impact they were having was inspiring. Each classroom tool can have a purpose beyond delivering content, and this needs to be shared.
I suppose the purpose of this website is collate, crystalise and open dialogues about how to increase this within classrooms. As the quote from Carl Bereiter illustrates this classroom methodology can empower our students.