inessential.com: Anatomy of a feature
http://inessential.com/2009/07/30/anatomy_of_a_feature

Good description of thinking thru feature implementation. error handling, sync failures, user feedback, etc

Anatomy of a feature: http://bit.ly/3R0Ws Great step-by-step guide on how an idea gets turned into software. [from http://twitter.com/dhinchcliffe/statuses/2954188093]

NetNewsWire's developer Brent Simmons describes all the UI decisions he had to go through before adding the Instapaper functionality to the feed reader's latest beta : "It’s not enough just to write the basic functionality and add a menu item that runs it. Even a feature as simple as this one requires some up-front thinking, some design."

A great post on just how much it really takes to "add this simple feature that does XXX" to software.

good

This jQuery plugin enables simple and easy creation of an interactive "Featured Items" widget.