This is an interesting (very) outside look at the effect dropping IE support could have on your startup. I can only imagine that the Web startup world is filled with the same angst as the Web design world in handling legacy browsers. It wasn’t an easy decision as it sounds like IE made up a decent percentage of their user base prior to flipping the switch.
Personally though, if I were to dive into a startup today I would absolutely axe IE support, it’s great to know others out there are doing it and continuing to do the work they love. Forcing yourself to deal with older IE versions in the startup world is overhead I would think to be extremely difficult to overcome.