Cohomology, Connections, Curvature and Characteristic classes: Mond
LNM0163 Deligne lectures on local systems, integrable connections, Gauss-Manin conn, differential eqs, regularity at infinity, etc.
http://nlab.mathforge.org/nlab/show/connection
nLab connection on a bundle
http://www.ncatlab.org/nlab/show/Grothendieck+connection
http://ncatlab.org/nlab/show/connection+for+coring
http://ncatlab.org/nlab/show/connection+for+a+differential+graded+algebra
nLab page on Connection