When thinking about new integration ideas that are out there I came across one that has been under my radar until recently. The ability to put web parts from Microsoft Office SharePoint Portal Server 2003 into your sharepoint is a great idea. From your Calendar to your Inbox to your Tasks and separate email account information. An example would be if your company has a generic email address that is used for sales information. You could have a sharepoint for the sales team where new leads were generated as well as Sales material.
Take a look at the material here http://www.microsoft.com/technet/prodtechnol/sppt/reskit/c4161881x.mspx