Two particular directions come to mind.
Going Down. People quibble over "endianisms." Whether superman could beat the hulk ... and whether a single-minded focus on AJAX is more legitimate than a single minded focus on Gradients, reflecty logos and the beta tag.
Because they both leave someone important out of the debate -- users.
Moving Forward. Figure out how Web2.0 delivers a better user experience. With user testing, response-driven content, and bottom line results. Figure out how graphic artists and programmers do something other than developing their resumes.
If Web 2.0 is something substantive, that's fine. But you are going to have to develop a methodology showing the tangible results. The fastest, most easily agreed upon way is put users into the debate. And that's more social than anything which has been put into this thread so far.