Official Google Enterprise Blog - In May, we announced our plans to integrate Google Apps with BlackBerry Enterprise Server, a popular feature request from many of our enterprise customers. Today, our team is excited to let you know that this integration is complete. Now, customers of Google Apps Premier and Education Editions can give their users access to Google Apps email, calendar, and contacts from the built-in BlackBerry applications that many users are already accustomed to. The tight integration between our connector and the BlackBerry Enterprise Server lets administrators manage BlackBerry access using the tools and policies they're already familiar with.

More: http://googleenterprise.blogspot.com/2009/08/google-apps-connector-for-blackberry.html