http://www.cacs.org/transparency_sf.php features interactive data visualizations of the San Francisco city Comprehensive Annual Financial Report including expenditures, revenues, performance outcomes like response time to crimes, debt, and other detailed data. This portal makes it easy for the average citizen to quickly navigate and understand SF data.

OpenDataPhilly is a portal that provides access to over 100 data sets, applications, and APIs related to the Philadelphia region. It is a joint project of The City of Philadelphia, NPowerPA, The William Penn Foundation, TechnicallyPhilly, WHYY, and Azavea.

New York City launched NYC OpenData (http://www.nyc.gov/opendata) in October 2011, which currently features nearly 850 API-enabled datasets. The possibilities are limitless for developers to create and innovate to help New Yorkers live more intelligent, efficient and informed lives by integrating OpenData into apps and websites.

The NYC BigApps (http://2011.nycbigapps.com/) competition challenges developers to innovate using NYC OpenData. Winning apps can be found at http://on.nyc.gov/nycappspage.

NYC has also created a Tumblr to showcase visualizations derived from NYC OpenData that New Yorkers will find interesting, compelling and thought-provoking at http://nycopendata.tumblr.com.

Open Data Catalog is an open source version of the software running OpenDataPhilly.org. It is available under an MIT license. It is based on Django, Python and Postgres.

http://opencolorado.org/ Open Colorado is working to make public data available and accessible to the citizens of Colorado from cities, counties, school districts, and special districts across the state.

This is a composite catalog of over 440,000 datasets from 116 data catalogs from cities, countries and international organizations around the world. The faceted browser on the right lets you hone in on the datasets you want, click on the name to go to the home catalog.