Wikipedia:Editor engagement
Growing Wikipedia and its community
Editor engagement projects encourage the growth of the volunteer community that builds the free encyclopedia. They include efforts to retain existing editors, as well as to engage new contributors to participate on Wikipedia. To advance these goals, the Wikimedia Foundation is working with community members on a range of new projects, which you can read about below.
Here are some of our most recent reports and milestones.

We’re happy to announce the release of Notifications on the English Wikipedia. Notifications inform users about new activity that affects them on Wikipedia and other Wikimedia projects, such as talk page messages, page reviews or edit reverts. It also lets them take quick action to respond to these events.

We've unveiled an experimental interface, provided to newly-registered Wikipedians immediately after they sign up. By encouraging users who otherwise don't have an idea where to get started to try simple editing tasks like fixing spelling and grammar, we hope to grow the community.
We call this the "oh shit" graph.

In early 2007, the number of active editors plateaued and then started decreasing. The rate at which new editors stick around plateaued even earlier, in early 2005, and then dropped sharply. These numbers haven't improved.

Please get involved: look at the data and research, join our active projects, help us make our technology and our processes better. Be bold and do the unexpected - everyone is a leader. March 2011 Update
—Sue Gardner, Executive Director of the Wikimedia Foundation, in an appeal to engage more editors on Wikipedia.
Join us! Participate in our discussions and activities, and learn about new features and experiments. You can subscribe to our mailing list,  and/or sign up for our on-wiki newsletters. 
Product managers, community organizers, developers, designers, and analysts. Template:EE/Profile/19
Here's a short list of our current projects aimed at improving editor engagement. Check out each talk page for comments or questions!