`fable` is the successor to `forecast`, according to Hyndman, though the latter is still maintained.
+1 for the book, an excellent reference. As someone who's primarily a developer, it's been extremely useful as a study guide.
Also, there's a new version; s/2/3 :)
It's useful as a study guide and reference even for someone who ostensibly learned all this stuff in school. It's a tremendously good book, and it's even more impressive that it's free to read online in a high-quality HTML document.
This is a good book and forecast is a very good R package, imo.