By: Minor Demons
Description: "Brain-sucking, flesh-eating, shape-shifting aliens are everywhere and they're all out to get you! But you're armed with XENOPROBE, the software that turns your handheld computer [PDA] into a personal alien detection device.
Created in conjunction with SCIFI.COM, Xenoprobe is simple, safe, and fun to use. Just aim it at your target, and press 'probe'. Xenoprobe will soon tell you if friends, family, and colleagues are really human or Linbari Leeches that will try to eat your bowels and sell you to the Salt Mines of Kessler 5!" (From the Minor Demons site).