There are some really nice reports for those of you that are TFS Administrators.
Browse in to your server like this http://your-server:8080/tfs/_oi/
There are two sets of reports, the Activity log and the TFS Job Monitoring
This reports shows every single command that every single user has executed against TFS from the last 14 days (the amount of days can be changed).
TFS Job Monitoring
This is a set of reports that show all jobs that are being rund from inside TFS by the TFS Background Job Agent.
Read more in Grant Holidays blog here