If you routinely park in locations with time-limited parking (a situation which isn't at all uncommon amongst some staff members at Lifehacker Towers), then news of an approaching parking officer is cause for a mass panic and much moving of vehicles. Mapkats aims to help alert you of impending parking doom via the iPhone.
The concept is simple enough: if you spot a parking officer, you tag their location (via Google Maps) using the app. Other people in the area can then be alerted of impending fines and act accordingly, whether that means moving the car or topping up the parking meter. How effective this is, of course, relies on the efficiency and honesty of contributors, but in parking-challenged areas, it's not hard to imagine it being taken up with some alacrity.
Mapkats is free for iPhone users. If you give it a try, let us know how it works in the comments.
Mapkats Parking Patrol Alerts [iTunes Store]