When I started my articles web http://www.SharePoint24x7.com people requested some content for BCS. I decided to write few articles on this topic and here you have the 1^st cut of it. Please take time to go through and provide your valuable feedback.

Article – Business Connectivity Services (BCS) Part I – Introduction – http://www.sharepoint24x7.com/2011/02/article-business-connectivity-services-bcs-part-i-introduction/