C-SPAN is offering a social media hub for both conventions with featured tools being video giant YouTube, which will be present at the Big Tent in Denver (see Google) as well as in St. Paul the week later. Also a featured partner is Qik, the live streaming video social service. Twitter is aggregating #DNC08 and #RNC08 tagged streams direct to the website as well.
C-SPAN is not affiliated with either party and the effort is to provide a grass-roots level into the conversation surrounding the conventions from interested parties in person (on site) and remote. I was asked to participate in video and twitter coverage, and I may, but it is not my niche. You’ll more likely see any real coverage over at my personal blog.
As a disclaimer, I am a non-partisan Barack Obama supporter so, while I’m most interested in the Denver coverage, I’ll be watching the St. Paul coverage as well.