For EQ usage I often share this video for FabFilter Pro-Q done by Dan Worrall
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http://www.youtube.com/watch?v=kSNYBbPAvKE It is short (10 minutes), very descriptive and covers several important topics for the effective use of EQ during the mixing stage of a project. It is primarily focused on the frequency spectrum portion of the stereo image, and is demonstrated using an actual mixing scenario. Granted, it is a "sales pitch" for FabFilter Pro-Q (which I do not own), but the concepts are quite universal and extremely well presented.