Poll: Startup Productivity Sinks
evhead.com
evhead.com
Also would be neat to correlate this with company size and stage of development. In my current startup (which is just me doing all the coding), the top productivity sinks are Internet distractions and slow decision-making, because most of the rest don't apply. In my last employer, the top ones were office distractions, bugs & errors, and working on things we don't finish.
And it's interesting how answers might change with hindsight. A couple months ago, I wrote a library that, if you asked me 2 weeks after I finished it, would've gone into the "Working on things that don't matter." Now I just happened to find another use for it, and it's now a critical part of our infrastructure.
But if anyone has any other suggestions for big ones, please comment.