Those of you who have tried changing people’s display name in active directory have noticed that TFS does not automatically pick up that change and propogate it to all of the appropriate places. It does pick it up and the pick list for the assigned to field, etc will be updated but existng bugs won’t be updated, alert subscriptions aren’t updated, etc. We are working on a long term fix to make TFS automatically pick it up and propagate it across the entire system. However, in the mean time, we have a stop gap measure. We have written a tool called TFSWitDisplayNames that can help you change the one or more display names throughout the system. We recently published a Knowledge Base article on it here: http://support.microsoft.com/default.aspx/kb/932717
For now you have to contact Microsoft support to get the tool but I hope to make it more widely available once we’ve shown it to work for many people.