This is great stuff. I think it would be very useful. The only thing, of course, is defining how it can plug into the whole system. I think this adds another important point to the modularity needs of the ACS. Modules should be able to plug in at the header and footer level of every page.
This kind of innovative stuff is precisely the reason why we need to push ArsDigita (and if not them, then OpenACS) towards a much more modular level that allows for this kind of contribution without centralized approval.
Go ahead and design this, and hopefully within a few weeks we'll be able to have the modularity we need to include this without breaking our ACS/Oracle ties...
