That may not be worthwhile to you per se, but 500 people in 50 cities around the world think it's useful.
In general, I agree with john, the more open-ness and access, the better it will be for everyone involved.
I was responding specifically to your confident assertion that "no one is bringing it together," which is a bit of a stretch, in fairness to the many projects that already exist. Lots of people are doing this sort of thing, both at the local level and national level: EveryBlock, the Sunlight Foundation, MySociety in the UK, independent one-off projects...
The point I was trying to make was, the data is out there (especially with Twitter) - if you're an interested hacker and you understand your unique local problems, why not figure out a way to build the tools that will help your community based on all the public data sources available, as opposed to waiting for EveryBlock (or anybody else) to expand their coverage.
I'm sure you've thought about the problem more than I have but de-centralization and encouraging communities to build their own tools seems like a much better longer term model, no?
I beg to differ! :-) That's exactly what we're doing at EveryBlock.com. We do the work of bringing together news and a whole lot of public data for public benefit.