Process Explorer

A lack of visual polish doesn't hurt this utility that replaces the cumbersome Windows Task Manager by showing running processes in an intuitive tree format. Process Explorer makes the job a lot easier by including program icons and other data, such as description, image, and processor time.

It also can identify the process for a given application window or look up a process name in Google--a handy way to spot spyware. Additional features offer detailed information on performance, DLLs, threads, handles, TCP/IP connections, security settings, and environments. Process Explorer is one of the best we've seen.