Microsoft Sysinternals has released a major update to Process Explorer to coincide with the release of The Windows Sysinternals Administrator's Reference book and the upcoming 15th anniversary of Sysinternals. The new version allows you to restart services, uses less memory and has redesigned, easier-to-read performance graphs (although a few people on the Sysinternals forum are complaining about the light-colored background making the graph difficult to read when the program is minimized to the system tray - and I agree with them). In addition, on Vista and higher it now offers GPU utilization and memory monitoring.