I have been learning Objective-C and Cocoa development lately, mostly so I can create a Mac version of my Flash Resource Manager application.
Anyways, since I live in San Francisco now, I figured that I need to know when earthquakes occur, so I created QuakeBar.
QuakeBar is a simple application for OS X that sits on the status bar, and lists the most recent earthquakes in the world, with a magnitude greater than 2.5 on the richter scale.
The icon will blink when there is a new earthquake, and you can click on an individual quake to go to a web site to get more detailed information.
It uses data from the United States Geographical Survey.
You can download the application from here.
The app is free, but if you end up using it, send me a postcard.
USE AT YOUR OWN RISK.