Man, that is a big bummer. Here is what I can tell you. I did this step by step on my machine and took screenshots of everything as was able to complete it successfully. Many others have emailed me and said they successfully followed these instructions and were able to get it working from the tutorial.

In addition, you can download the exact project I created with all of the code so you could go through in detail and see if any properties or settings or DLL versions are different to help you troubleshoot.

It could be you are running a different version of Entity Framework or RIA than I had installed as well.

For issue one with the namespaces, yes, if you change the domain, you will have to recopy the files. I wish MS would fix this!

Issue 2, I am not sure why you are getting the IEnumerable error. Not enough info there for me to tell.

Issue 3, the service does need a reference but when I did this, it was automatically added by VS 2010.

Issue 4, if Silverlight can't find the context, then it can be one of many reasons but a likely issue could be that you are not targetting the correct RIA assembly in the properties of your Silverlight app.