It's the little things that count.
I found out how the iPhone (and other devices) can locate you based on wifi networks alone. Apparently some companies just drive around checking for wireless networks and save their locations. Also, it appears that whenever you get a GPS fix, and then query for location data, it uses the combination of your GPS+wifi listing to store new information about the wifi networks. I wish I had gotten in on the ground floor of that.
Tutorial on how to make this icon:
and this button (programmatically):
As well as 8 confusing Objective-C warnings that I expect to be seeing a lot of in the future.
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