There are two killers of (startup) productivity. The first one is procrastination. You know what needs to be done, you just been busy doing something safe or more interesting. The second is lack of focus on what's important and urgent.
The fix for both of those is a "NOT TODO" list. Things that you should not be doing on a daily, weekly or monthly basis, no matter how attractive they seem. On startup-land, if it's not urgent, likely it should be postponed, and if it's not important you shouldn't even be spending brain cycles on it.
I'm the Co-founder & CTO of 
