From Stephen Kosslyn, Havard Psychology, relatively nearterm paths to increasing intelligence
Cognitive neuroscience and related fields have identified a host of distinct neural systems in the human brain. Different combinations of these systems are used in the service of accomplishing different tasks, and each system can be made more efficient by "targeted training." Such training involves having people perform tasks that are designed to exercise very specific abilities, which grow out of distinct neural networks.
Understanding the nature of group problem solving will increase human intelligence.
Increasingly powerful and accessible machines and knowldge to help us extend our intelligence. Richer, faster and better wikipedia and google. As well as better interfaces.