A good (long and crunchy) introduction to complexity theory can be found here.
Another blog I frequent that’s intensely interested in complex systems is Dave Pollard’s How to Save the World, and, as it happens, he’s also recently put up a post on emergence.
I remember the importance of systems thinking first hitting me when I read Peter Senge’s Fifth Discipline. His book Schools That Learn has been sitting on my “to finish” bookshelf forever. The big takeaway I remember is the importance of finding and (gingerly) applying points of leverage — with the attitude that living, breathing dynamic systems are like spinning plates, requiring constant observation, reflection, and vigilance.
Important to remember as I put together my grandiose plans for the year. You prep and prep, think and think, but then you just have to let it fly and let it go.