BCS is now available in SharePoint 2010 at the Foundation level.
However seems that some people inside SharePoint team and Visual Studio team did not got the memo 🙂
The code to install the BCS model is only available inside a dll that is installed with the Standard/Enterprise edition of SharePoint 2010 Server.
I have just published a new project on CodePlex: http://bcsmodelreceiver.codeplex.com/ that will install the missing code as a Farm feature and will permit to install your BCS Model feature correctly on any platform. It is a Farm feature that will ease the pain of deploying BCS Models inside SharePoint 2010 especially the Foundation.
The code used in this project was actually published by Microsoft at: http://code.msdn.microsoft.com/BDCSPFoundation The only thing I have done is to put it together as a reusable feature so you do not have to cut and paste the code in each of the project.
Now, to use this feature, there is a small tweak that the developer has to do in Visual Studio, and that is to reference the BCS Model Feature Class from this project.