If you've never used it before, think of it like Task Manager on steroids, without the roid rage.
Changes in v11 (Vista items bolded)
New treelist control for better UI responsiveness
Asynchronous thread symbol resolution on threads tab of process properties
More flags on groups in security tab and SID display
Thread IDs on threads tab
On-line search uses default web browser and search engine
Vista ASLR column for processes and DLLs
Vista Process and thread I/O and memory priorities in process and thread properties
Vista Process and thread I/O and memory columns
PROCESS_QUERY_LIMITED_INFORMATION support on process permissions on Vista
Run as limited user runs with low IL on Vista
Reports information for all object types on Vista
Show details for all processes elevation menu item on Vista
Supports replacement of task manager on Vista
/e to launch elevated
/s switch to select a process at startup
Compiled w/ASLR, DEP
Faster startup
Miscellaneous bug fixes and minor improvements
Check it out
here.
Update: Michael Wallendahl pointed out my error - I was calling the program Process Monitor when it is actually Process Explorer. I have a bad habit of switching the two. Thanks!