Some helpful and quick reference infographics from a Canadian design firm called Paper Leaf:
Here are some design-related sites that I visit regularly:
Quipsologies (Quick and easy to digest.)
Design Observer (More in-depth. Their Design Matters podcast is one of my favorites.)
Creative Mornings (Video: talks from some of the most interesting people working in creative fields today.)
Fast Company’s Co.Design (Design + Business = Insight)
But I have many, many more graphic design links on my other website. Scroll to the bottom and you’ll find the motherload there.