The N800 makes a great portable network security device. Here's a nice easy to use tool to add to its toolbox.
It's called AutoScan (follow the link to download and get the Nokia 770 arm binary) and, not surprisingly, it's a scanner. What's cool about it is it sports a well classy GUI, so once it's taken a good look at your network it gives you a nice graphic view of what's connected, what OSes are running, and what ports are open.
Those familiar with AutoScan on an x86 system will know that AutoScan has plenty more features up its sleeve such as the ability to run Python and Perl scripts from within the app, but many of these advanced functions tend to freeze or are inaccessible on the N800.
Still, the basic functions work well and if you have a few idle moments and are sitting around with your N800 you can do a lot worse than run a quick AutoScan for a rough and ready guide to what's connected and, perhaps, vulnerable.
It's not a complete alternative to Nmap and it has its bugs in the N800, but it's still worth taking a look at if you're interested in network security...