Most commonly used features, programing problems, etc would have been handy perhaps. However, usually one just goes with it and when seeing something of interest that is what you learn or more commonly, when facing a problem.

A couple of month ago I learned about connecting ssrs to a wcf. I didnt want calculation logic in two places, it was already in the application service layer and it would be redundant to include the same logic into another place, the database. So the data source of my ssrs report for this project was my wcf services. Perhaps that's something sql- / reporting people should know about in case you don't. However, there are many things one should know about...