Zenmap is the official Nmap Security Scanner GUI. It is a multi-platform
(Linux, Windows, Mac OS X, BSD, etc.) free and open source application
which aims to make Nmap easy for beginners to use while providing
advanced features for experienced Nmap users. Frequently used scans
can be saved as profiles to make them easy to run repeatedly. A
command creator allows interactive creation of Nmap command
lines. Scan results can be saved and viewed later. Saved scan results
can be compared with one another to see how they differ. The results
of recent scans are stored in a searchable database.
You can download Zenmap (often packaged with Nmap itself) from the Nmap download page. Zenmap is quite intuitive, but you can learn more about using it from the Zenmap User's Guide or check out the Zenmap man page for some quick reference information.
Here are some Zenmap action shots (click for full res):
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