The SharePoint Team Blog has a great series that walks you through the creation of an external list using Visual Studio 2010 and the new Business Data Connectivity Designer! The first two posts of the series are already live with more to come.
- Walkthrough of enabling CRUD for SharePoint 2010 external lists using Visual Studio 2010
- Walkthrough of creating a SharePoint 2010 external list using Visual Studio 2010 Beta
– Lionel Robinson, Program Manager