Register as a Salesforce.com Partner
To do this, go to http://www.salesforce.com/partners/join/ and fill the form.
Listings are the primary marketing tool for promoting your app or consulting service on the AppExchange.
While private, your app has a link on the AppExchange (which you can send to potential users), but it is not listed publicly and does not show up in searches.
Run a free self-service source code analysis against code developed on the Force.com platform:
Run a free web application scan against your external web-application that is integrated with Force.com.