GivingMarket/OneBigBlogRollMore and more it seems the central GivingMarket space and function could be /OneBigBlogRoll... a giant list that could start as 50 people all adding the same 50-blog blogroll to their project/issue blog, then cutting it down over time to fit their purposes and adding to it as new GivingMarket participants surface and introduce themselves.
A central /GivingMarketBlog could serve as the introduction podium or center of the circle, where all new participants were introduced. The introductions might follow along the lines of the /StrategicGivingQuestions. More and more, the GivingMarket doesn't need to be as big and central as it wants to be personally juicy.