From time to time, the corpus of information technologies absorbs new classes of technology, often in one fell swoop. The collection of technologies discussed here -- social, mobile, analytics, and cloud (SMAC) -- represents such a bundle. A decade ago, social, mobile, and cloud technologies were more a gleam in the eye of innovators than part of the CIO repertoire. Back then, analytics were frozen in a period of glacial change that was moving far too slow to attract much attention except from analysts trying to divine which bigger vendor was going to buy which smaller vendor. Today, social, mobile, analytics, and cloud are the cornerstone technologies driving innovation inside many if not most enterprises. In this issue of Cutter IT Journal, we bring together five articles with some different looks at the opportunities and challenges SMAC poses.