Some time ago Nokia quietly released a Phone Software Update tool. If you've got a Nokia N-series phone acquired in the last two years, or one of any of the other phones supported, it's well worth the time to update to the latest versions of the firmware. For example, after receiving the new N95 last week, and admiring the WiFi scanner tools that shipped with it, I updated my N93, N90, and N80, all of which now can use those same WiFi scanner tool.
Warning: back up the phone first. It wipes the phone's internal memory completely.