Shamelessly stolen from Scott Hanselman's most excellent Ultimate Developer Tools List, Task Manager Extension is one of my favorite new addins.

Like Notepad, Task Manager is something I use on a daily basis: it's an essential part of my toolkit. I took a look at some replacements, but I'm so used to Taskman at this point, I can't retrain myself. And with Task Manager Extension, I don't have to; it adds all the "missing" features you could possibly want:

• Shows application icons in Processes list
• Shows services in a different color
• Find files in use by any process (* shows all files in use)
• Find modules in use by any process (full text search)
• Shows process id in Applications tab
• Use different color for processes using lots of CPU time
• Query list of files, handles, modules, windows used by a given process
• Close a used file, or unlock an exclusively opened file for deletion
• Press the Delete key to kill a process or a service