Andy Clark provides us with a new framework for thinking about the mind. Gone are the old notions of a clean boundary between the thinker and the world. Clark does a great job of making the point that our brains are essentially embodied agents that profit profoundly from the local environmental structure. He introduces this new movement in cognitive science to study the brain, body, and world together as a complex system of interactions and dependencies and calls for a cognitive science of the embodied mind.
Clark is not proposing a radical idea. In fact, he defends at some length that his work is in fact a solution to the radical ideas that currently dominate the field. Clark suggests refining the tools of study used, and finding a middle ground between competing theories. I personally question whether a middle ground is appropriate in science. When anomalies exist in current models, does it serve us well to take the best of all available theories and smooth them together as Clark does? Perhaps in the case of the brain, this is a good idea, even though many other sciences (like physics) fair better with simpler one-size-fits-all solutions. Due to the brain's complexity unmatched anywhere in the known universe, maybe a simple (radical) way of studying it isn't possible (or at least within human capabilities).
Clark certainly builds a strong case, particularly by applying examples and comparisons throughout the book. His ideas are well thought out, his writing is clear (though perhaps a little repetitive), and the book as a whole is well worth reading.
Being There definitely gets you thinking.