I don't. I used to have a Google Doc with dozens of ideas, but I recently deleted it. It's just idea-porn.
The good ideas -- the ones worth doing -- keep coming back to you, gnawing at you until you can't put them off any longer. It's a real problem you continually run into, and it's something you care about. So much more valuable than a list of half-baked ideas you had randomly on the bus.
The good ideas -- the ones worth doing -- keep coming back to you, gnawing at you until you can't put them off any longer. It's a real problem you continually run into, and it's something you care about. So much more valuable than a list of half-baked ideas you had randomly on the bus.