I developed a custom report for SQL Server Management Studio that wraps the partition details and row counts query I previously posted. Visit the Codeplex project site for details. You can download just the released RDL file or, if you want to customize the report to your liking, download the full project source code. Alternatively you can create a new report project of your own and add the RDL file as an existing project item.
I welcome any feedback you might have, either here or via the Codeplex project discussion page. It’s been a while since I’ve done any Reporting Services development so there is certainly room for improvement. Additional project team members are also welcome.