I follow a number of blogs, a few regularly. The ones I read are grouped in the link section of popular urbanist blogs like Ecology of Absence. I think a big reason blogs are popular in some circles is because you can find information about things you're interested in written by people with an active interest in the same issues.
In the case of the urbanists blogs, the writers tend to be our neighbors, working in their daily lives on the issues they write about in their blogs. So there's a sense of involvement, community activism, and common interest.
With the growing use of online communications, what if the bloggers tried to focus on a few key issues? Would they be able to have a bigger impact? Or are bloggers just too independent a group to develop a set of shared priorities? If they did identify some priority issues, what would they be?
Historic preservation gets a lot of attention in the blogs, as does the idea of "form based zoning". Cycling and transportation planning are other areas often written about. All of these topics are part of the realm dealt with by government and community process. How would bloggers influence these arenas?
When attending neighborhood meetings, the impression I get is that most average citizens do not read blogs. So they wouldn't be aware of a unified blogger voice. Meanwhile, a good way to get a cold shoulder is to arrive at a neighborhood meeting, unknown to neighborhood regulars, coming from another part of town, pushing an issue or agenda. It seems for bloggers to have a bigger impact, there needs to be wider use of electronic communications by average residents and a wider sense of community beyond individual neighborhoods.
Maybe that's an issue blogger unification might address? Building a wider sense of community across neighborhood boundaries? How might that happen? Maybe it takes years since it is going against the grain of St. Louis tradition.