How to see the Check-In History of a particular user in TFS (TFS-2008)?
How to: Find a Changeset in Visual Studio 2010:
In Source Control Explorer, on the File menu, point to Source Control, and then click Find Changesets.
For some reason newer versions of the article are in a different location. Here are links to newer versions of the article:
How to: Find a Changeset in Visual Studio 2012
How to: Find a Changeset in Visual Studio 2013