I think one of the things I look for in a writing project is a deadline, the idea that I have a goal to reach as much as I have a story to tell. I've got ideas - there's about five plots I've got bouncing around in would-be novel formats, there's eight Talents (superhero) stories on the backburner off the top of my head, just came up with a plot idea two weeks ago I haven't even fleshed out yet - but without a deadline or sense of urgency those stories just, well, sit there.
One thing that's been mentioned before and something I've finally taken a look at is this site Wattpad. It's a self-publishing submission site for storytelling, covering not only fanfiction but also original fiction. It tracks online readers so you can get an idea how many people are reading - and liking - your stories. You can publish in a serial format, meaning you can do a novel chapter-by-chapter. I'm not entirely certain of the copyright rules - if you want to pull the online work so you can go publish it as a print novel - but I think it favors the writer being able to control their ownership of work.
My Camp NaNo project may not necessarily fit this serialized format... but one of my other science fiction story ideas might.
I'm going to trying this out this month of May, see how it goes.