Fernando Bunn has some very helpful advice if it happens to be 2005 where you are:
The future is here! You have just spent $129 for the newest release of Mac OS X: Tiger. You’re amazed by the brand new Spotlight and Safari RSS, you like your new OS so much you want to develop apps for it. You read on Apple’s website about this app “Xcode” that just received the version 2.0 update. That’s it! Time to code!
You fire up Safari, go to Yahoo! and start searching for Xcode tutorials, unfortunately, besides a bunch of Geocities websites mentioning “Web 2.0” (or whatever that means), you don’t find much information online on how to create apps for Tiger.
Wouldn’t it be nice to find a tutorial to help you to get started?