Heads up: I just can't get enough. I've signed up to blog for the neighborhood I live in, Piedmont. Take a look at 97217.net. The creators (and the people who pay me a very small amount for blogging) are putting together a nation-wide network of neighborhoods. They're looking for bloggers for every zip code. Let me know if you're interested, or if you want to help make blogging history, i.e. hang out. (I'll probably document visits to neighborhood businesses, etc.)
And just for fun, here's a link to a (very detailed) map of Portland's neighborhoods. I've never known a place with such a strong focus on neighborhoods. It's something I love about this place.