Tabs. Every web programmer has at some point been asked by the UI Team, the Marketing folks, or Upper Management to "Tabify" their web app. Every web programmer has. Ubiquitously.
Well, I present to you a pretty good--and very elegant solution to tabs… Sliding Doors [http://www.alistapart.com/articles/slidingdoors/]. Created by Douglas Bowman, this solution is incredibly easy to implement, and he's written a very good article on alistapart.com. Go check it out.
And a screenshot of my own implementation. Thanks Doug, for a great example.