There is a new tool based on DGML technology that visualize Work Items and there links.
The tool is very simple to use, yet very powerful.
Its a simple EXE file that launches a WPF application.
Follow these step to use it:
Step 1: Choose the collection to use and click Connect
Step 2: Select the Team Project and click Select
Step 3: Choose a Query
Step 4: Choose the Work Items to Analyze
Step 5: Choose the Link Types you like to Analyze
Step 6: Choose the type of Analysis you like to have
Step 7: Click Work Items button to start the Analysis
You can see the result graph, it contains the Work Items and there links including the Changesets and there files.
You can find the application in the codeplex site: http://visualization.codeplex.com/