I've heard that other authors write the ending first so they know how everything has to end up.
And there are probably authors who start right in the middle and work outward toward each end. (Although this strikes me as a very confusing way to write!)
I have always been a linear writer -- starting at the beginning, and hacking my way through the word jungle til I reach the bitter end. But with this manuscript, I'm trying it differently and writing scenes out of order. It's not exactly Diana Gabaldon's method, but it's new to me and has given me fresh energy. We'll see if it works.
How about you? Do you write linearly or Gabaldonly?