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10 Things I always forget before launching a website… | The Design O'Blog by Niki Brown
TidBITS Macs & Mac OS X: Revealing Mac OS X's Hidden Single-Application Mode

This is absolutely brilliant. I've just enabled it on my work Mac, which generally has 10+ apps running. (Browser, Mail, IDE, chat client, iCal, spreadsheet, DB client, RSS reader, terminal, iTunes, PDF reader, various others), and suddenly my level of visual clutter is down to near zero.
Having returned from an archeological dig into the dark history of Mac OS X, I've unearthed a feature that could change the way you interact with your applications, enabling you to focus on one or two more easily than in the past. Back in 1999, when Steve Jobs first showed off the new Finder in Mac OS X, it ran in a single-application mode, where switching from one application to another caused the first application to minimize (this was the original demo of the Genie effect1). This was intended to be the default behavior, but it was so widely reviled that Apple quickly changed the default to the familiar multi-application mode that shows multiple applications on the screen at the same time. Mac OS X's multi-application mode differed from how previous versions of the Mac OS worked in that it interleaved all open windows without regard to which application they belonged to, a feature that annoyed a lot of long-time Mac users. - Move an iTunes library to just about anywhere