Yesterday at SXSW Interactive I gave a talk called "Scaling Rails in the Cloud", about our experiences building OtherInbox using Amazon Web Services. My slides are below. When I wrote this presentation, I really came to the realization that Rails has hardly ever been the problem for us, scaling-wise. The framework has served us very well; all of our problems have stemmed from we the developers not understanding our tools as well as we could have, or not thinking things through. So the actual Rails content is light, but that's because Rails fits right into a cloud environment and we didn't have to do anything special to make it work.