When Media Foundation was introduced in Windows Vista, it did not have any graphical tool analogous to DirectShow's GraphEdit. Now there is such a tool, named "TopoEdit." (Topologies are the Media Foundation equivalent of filter graphs.) You can see a pre-release version of TopoEdit in RC0 of Windows SDK for Windows Server 2008.
To quote from the SDK help:
TopoEdit is a visual tool for building and testing topologies. With TopoEdit, you can perform the following tasks:
Build a topology by adding various topology nodes like source, transform, and output nodes.
Connect and resolve the topology structure.
Test the functionality of the topology through playback.
TopoEdit will be provided both as an executable and as source code (as an SDK sample). Here is a screenshot of the TopoEdit main window:
For more information: http://msdn2.microsoft.com/en-us/library/bb970416(VS.85).aspx.