DBAs and Developers measuring query performance is important.  Indexing and query performance is one area for a DBA to really shine.  A couple adjustments and you can be a hero for a day.

Also, if you want to measure many other performance counters on SQL Server/Windows, and many other (IIS, Exchange, network hardware) around the clock and all at the same time, check out http://www.ascendview.com  I have purchased this product and have been using it since March 05.