This series on blurs join others on Lynda.com, including the recent AE tutorial sets Natural Light Effects and Light Transmission, mentioned in a previous AEP backgrounder. If you don't have a Lynda.com subscription, you might try a free 7-day pass to check out the massive library beyond the free samples.
And of course there's a hefty amount of completely free stuff from this team at their PVC blogs Creating Motion Graphics and CMG Keyframes, and at Focal Press and Artbeats.
Update: Chris and Trish Meyer also posted After Effects Tips 5: Going for a Scroll explaining techniques to easily create scrolling banners, ticker tapes, and other graphics. And later they covered important basics in After Effects Apprentice Video Tutorial #6 , "a quickie on how to use the 3D Axis Arrows to manipulate 3D layers"