Friend and mega-librarian Marylain Block's "Neat New Stuff" column (http://marylaine.com/neatnew.html) points us to another example of a great community-building tool.  She writes:


•  Outside.in
http://outside.in/
Steven Johnson aims to "collectively build the geographic Web, neighborhood by neighborhood." So far it's added various kinds of data for over 2500 neighborhoods. Entries may range from neighborhood restaurants, shops, and museums, to descriptions of historic architecture or local celebrations. If your city or neighborhood isn't here yet, you can upload data to begin a file for it (librarians might add their own libraries to the database). This has the potential to be extremely valuable.