Any suggestions for sources to learn about (co)homology with twisted/local coefficients? I've read Hatcher's section 3.H and have previously been directed to Sakasai's paper A Survey of Magnus Representations. Do people have any other favorite sources, especially those with lots of examples, to understand this somewhat mind-twisting topic? Books, notes, papers, recorded lectures, I'll take them all.
To focus things a bit, I should say that I'm a topologist. So I prefer things to be more of a pictorial/geometric nature rather than straight algebra. Also, I'm curious if there is any sort of generalized Poincare duality statement for manifolds with arbitrary coefficient systems. If you know a reference about that, please do share.