In addition to Nmap I use SuperScan (http://www.foundstone.com/resources/...superscan4.htm ), which is a port scanner made by Foundstone. It's easy to use, runs on Windows, and free.

Another port scanner made by Foundstone is ScanLine (http://www.foundstone.com/resources/...c/scanline.htm). It's a command line scanner that runs on Windows.

What are you looking for or trying to achieve?