In some situations, there may be a need to restrict some of the options that users see on the toolbar in a list or a library. Codeplex has a tool for this that is part of the SharePoint Features project. I recommend that anyone interested in this functionality, take a look at this tool-
Here are some screenshots of the toolbar manager in my test environment:
This is just one of the many tools that are out there. Be sure to spend some time going through the other features on the Codeplex features project. You will probably find a tool there that you can easily incorporate into the solutions you are building.