I like this post by Klaas Pieter Annema about cleaning up your App Delegate, specifically the application:didFinishLaunchingWithOptions: method which tends to get cluttered up with all sorts of framework and 3rd party service initialisations.
Sam Deane on optionals in Swift being more than just a language feature by also helping improve readability and explain the intent of source. I especially liked this post as it reminded me of some of the internal conversations I've been having with myself as I learn Swift. The language itself is pretty easy to learn and I was up to speed in a short amount of time, but really figuring it out is going to take longer.
Oktawian Chojnacki with a nice set of samples detailing how to implement some of the classic design patterns in Swift. It doesn't concern itself with the "why's" or "should you's", it's just a concise page with sample code. Nicely done.