Although companies are still running "perkshops," many are learning that they need to nurture the informal networks and workshops in which their employees actually learn stuff. These guerilla learning strategies can be as simple as a gumball machine to lure passers-by into conversations, a map instead of a white paper or dumping cubicles in favor of sofas and more convivial furniture. Pair programming, a practice spreading from software development to many other fields, also helps.