Watch a five minute introduction video

http://umbraco.org/help-and-support/video-tutorials/getting-started/what-is-umbraco

Umbraco - the simple, flexible and friendly ASP.NET CMS

More than 155,000 sites trust Umbraco
For the first time on the Microsoft platform a free user and developer friendly cms that makes it quick and easy to create websites - or a breeze to build complex web applications. umbraco got award-winning integration capabilities and supports your ASP.NET User and Custom Controls out of the box. It's a developers dream and your users will love it too. Used by more than 110,000 active websites including http://daviscup.com, http://heinz.com, http://peugeot.com, http://www.hersheys.com/ and The Official ASP.NET website from Microsoft http://asp.net you can be sure that the technology is proven, stable and scales.
More info at http://umbraco.org

Forums

We have a forum running on http://our.umbraco.org. The discussions area on CodePlex will be for discussions on developing the core, and not on Umbraco-implementations or extensions in general. For those topics, please use http://our.umbraco.org.

Contribute to Umbraco

If you want to contribute back to Umbraco you should check out our guide to contributing.

Submitting Issues

Another way you can contribute to Umbraco is by providing issue reports, for information on how to submit an issue report refer to our online guide for reporting issues. To view existing issues please visit http://issues.umbraco.org