This happened to me all the time before I started putting valuable insights into Anki. I find that 1 card per outstanding article or lecture and 1-3 cards per excellent book is about right. (This is the only thing I use Anki for.)
I tried this but went about it wrong, I wrote a whole bunch of cards like I was making comprehensive notes (around the level of detail of the MineZone book notes), and ended up getting frustrated by the chaff of disordered small notes that the system threw back at me. One card per article / book section seems like a good rule of thumb.
Do you have any conventions for turning insights that don't necessarily go into a neat question/answer format into card halves? Just put the whole thing on the front of the card?
Previous Open Thread: http://lesswrong.com/r/discussion/lw/k94/open_thread_may_19_25_2014/
You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should start on Monday, and end on Sunday.
4. Open Threads should be posted in Discussion, and not Main.