There are some great tips here for getting started with unit testing in Swift. How to combat the access control problem (just make everything public, right?), how to easily initialise objects for testing purposes and dealing with testing optionals.
Omar Abdelhafith with a fantastic set of tips for keeping yourself sane while using Auto Layout. Apart from tool support in Xcode 4.x, much of what has made Auto Layout painful to get to grips with is it's a much more sophisticated system than we have had in the past. With that sophistication comes the need for much more knowledge about how to work with it. So it's great that posts like this and Jonathon Mah's recent post are being written.
Mattt Thompson with an interesting experiment looking at shorthand syntax for creating various Cocoa types. I fully expect the language to expand to officially support this kind of thing as it matures and Mattt is not recommending it for production use for that reason.
Now the really important question for Mattt. When do we get a Swift version of the British Invasion? It's time... 😝