In case you've been asleep at the keyboard, serial fiction has been experiencing a re-birth of sorts, helped along in no small part by the ease of self-publishing.
It is now a simple enough thing to get your book into print, so if you have a half finished novel, you could break that into parts and release a serialized version. Giving yourself enough time to test the waters for your book an d make changes as you go along. (Oh, and also have a good reason to finish it!)
I know a few authors who are working on various serial fiction projects, including my friends Sean Platt and David W. Wright who are responsible for the wildly successful Yesterday's Gone series.
There numerous serial fiction titles now for sale at Amazon with more on the way. They span genres, offering tales as diverse as science fiction, mystery, thriller, suspense, horror and a mixed-bag of them all.
But I have seen signs of serial fiction work appearing in print newspapers as well as eBooks. Like the new "Mysterious City" feature now appearing in the Chicago Tribune.
I myself have always been a fan of serialized fiction. As someone who reads every chance he gets, I can appreciate stories which are short enough for me to get my fill in the tiny spaces which I have available for reading. I also enjoy a good mystery, and don't mind cliff hangers that keep me engaged. There is also an inherent tendency for serial fiction writers to write very tight. In other words, there is no room for fluffery in serial fiction (yes, it's a word in MY dictionary.)
If you haven't read any serial fiction lately, give it a try. And if you have a story which might benefit from being broken into pieces, give that a try too. You never know what you might learn from doing either.