2. Technical: "Guidelines for Ventilating Attics and Cathedral Ceilings to Avoid Icings at Their Eaves" is a very technical article (lots of math and graphs) available on the website of the US Army Corps of Engineers Engineer Research and Development Center.
3. Technical: The principles of natural ventilation (as opposed to fan-driven ventilation) are presented well in this article at the Whole Building Design Guide site, which is maintained by the National Institute of Building Sciences.
6. You can find ventilation product manufacturers here.