As some of you might already encountered and found this blog entry while searching the internet, there can be a problem having certain installtion levels of the Data Dude installed on your machines.
The error message is:
The service Microsoft.VisualStudio.Shell.Interop.ISelectionContainer already exists in the service container
Parameter name: serviceType
The problem is the PowerTool installation, some words about that and how to fix it can be seen on my colleagues blog.