With whatsrunning you can view exactly wich processes and services are active in your Windows (2000/XP/2003server) processes.
This can be done in taskmanager, but whatsrunning shows wich process belongs to wich programm.
Info from their site:
What's Running is a product that gives you an inside look into your Windows 2000/XP/2003 system.
Explore processes, services, modules, IP-connections, drivers and much more through a simple to use application. Find out important information such as what modules are involved in a specific process.
Control your system by starting and stopping services and processes. Configure your startup programs easily.
Start taking control of your computer now!
and the other screenshots can be found here: