Yesterday I attended a meetup for Code for Seattle, which is a group of people who want to help out local communities by building applications that use data supplied by local government.
Seattle has a ton of data available for applications at data.seattle.gov.
The initial project is to create a wiki specific to Seattle and the surrounding communities where everyone can create a page for their favorite restaurant, park or dog walk or whatever you want.
We plan on adding cool features to the wiki that use the data supplied at data.seattle.gov to enhance the user experience while on the wiki.
Wanna join?
http://www.meetup.com/Code-for-Seattle/