I'm a big believer in schedules and priorities, but occasionally I come across something that's really amazing. At this point, I engage in the amazing thing without beating myself up or feeling guilty over it.
Today I found "Learn Writing With Uncle Jim," an amazing forum thread on writing. It's written by James McDonald, and he's got a sharp, clear thinking way about him.
I'm shifting everything else back a little bit, because it's such good stuff. It's about writing fiction, which I don't do, but he's such a clear thinker that it's enjoyable and worth reading anyways. Highly recommended. Also recommended: Embrace it when you find something that's worth massively a lot even if it's not on your to-do list. The to-do list exists to serve you, you don't serve it.
If scope is growing faster than completion is happening, and no plan is being made for that, eventually the amount to-be-done will be unmanageable.
A few ways to do deal with it --
*Say no to some things.
*Build structure to handle higher capacity.
*Set defined completion/launch/celebrate periods, and hold them religiously.