To get started with messing around with Swift, IBM have created a Swift Sandbox on the web, so you can run Swift on Linux within a browser to play with it. Interesting stuff as it appears that IBM are interested in Swift on server.
Also interesting is the Perfect application server for creating server side API applications.
I’ve also found these resources helpful:
- The The Swift Programming Language book (epub)
- Both Jesse Squires’ Twitter & blog
- Greg Heo’s blog
- Swift unboxed
- If you have lots of time, join the swift-users mailing list