Apple recently banned apps it deems "too sexy" from the App Store — and now it's gotten rid of another category of applications: WiFi locators. Apps like WiFi Finder were purged from the store yesterday. The deleted apps were more than databases of known hotpots; they actually used the iPhone's WiFi sensors to detect nearby hotspots.
Unlike the sexy-apps ban, which bans applications that Apple deems too racy, this move is technically motivated. WiFi finders run using private APIs, a type of technology built into the iPhone that may be removed in subsequent phone updates. Maybe this move means Apple is readying itself to release the next generation iPhone. If you're upset about the loss of WiFi-detecting apps, don't worry: there are plenty of products (like this keychain) that can detect a wireless signal.