To really put the icing on the cake of our new architecture, integrating Zimbra and Alfresco would be perfect. The sorts of things I'm thinking about are email archiving duties being handled by Alfresco (it's supremely logical that the project/customer emails are just with the related documents and images etc.), access to Alfresco spaces from within Zimbra (additional tab? instead of documents? not sure, but it should be as locked in as dates are to the calendar, but associated with client or project names) and for nirvana, the ability to right click an email and send it to the appropriate Alfresco space.
Maybe there are other areas, who knows? Any suggestions, volunteers for collaboration, news from Zimbra that this is now on the cards for version after next, or people with code to already do it... I know there is at least one other customer of both companies out there (H&R Block people, you out there?) and almost certainly others. Got to be a great solution tie-up.