Crack those knuckles, plug in that ergo keyboard, sharpen those pencils, click those G2s -- whatever your medium -- November is NaNoWriMo!
When all you need is a kick in the pants to get started, something like this, NaNoWriMo, with legions of followers all dedicated to attempting a similar goal, should be enough incentive.
Don't let that great plot idea get away from you (you know, the one you had during that last bad movie you watched?)... Write it down!
Who knows? You could be looking at a six-figure advance before you know it.