Diffuser diffusion

Now that a court has ruled the diffusers on the Brawn, Williams and Toyota are legal (and within the spirit of the law), the race is now on for other teams to develop and perfect their own diffusers. How quickly will this happen? What knowledge do the other teams already have of their rivals' diffusers? If they have some knowledge, how might this be used and incorporated into their own designs? If they have no knowledge, what will be the process of adding diffuser technology to their cars? In summary, how is knowledge about diffusers being diffused? And might we ultimately see diffusion of the technology into road-going vehicles?