Cool tool to analyze TCP Port activity

Windows has a command line tool to monitor which ports are used by which process called "netstat". But this tool is not very easy to use and on some operations very slow. But fortunatetly the genius guys from Sysinternals provide the great tool TCPView for this task. With this tool you see a overview of all used tcp ports and their status. So for example you can easily find out which process listens on which ports. You can even kill processes to free the ports in this tool.