My old team is having a developer dinner tomorrow night titled Developing SharePoint 2010 Solutions Using External Data and Services. See here for more details at http://bit.ly/kPUq5n.
What you will learn
SharePoint 2010 allows developers to work with both internal and external data using Business Connectivity Services (BCS), Excel Services, Access Services and custom WCF services. During the presentation we will discuss and demonstrate several common usage scenarios.