A couple TED Talks that you should consider required viewing over the weekend, and should help you as you translate ideas to form during the modelling charrette:
First, Ole Scheeren (formerly of OMA) talks about how architecture can tell a story through program, and through form. Their “Interlace” project is an excellent case study. He also shows some really nice diagrams and mentions programmatic clusters.
Second, Alejandro Aravena talks about how his practice engages communities in their housing projects; particularly one project where they proposed building “half homes” that families could finish building themselves. If Aravena’s name sounds familiar, he was just awarded the Pritzker Prize award (basically the Nobel Prize for architecture) a few days ago.