A nice overview of the internals of a major SaaS platform. Bobby Grace writes, on the Fog Creek Software blog, in How We Make Trello:
Look around you. Is there something nearby that is firmly bolted to the ground? Okay good. Hold onto it. I’m about to pull back the curtains on everything you thought you knew about how Trello was made. The revelation could result in a rippling shockwave that knocks you off your seat and may have troubling, unpredictable consequences for the time-space continuum. Possibly.
Incidentally, if you haven’t already tried out Trello, give it a shot. You just might like it.