Two of the best tutorials for this often overlooked subject when learning to draw manga:
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Link list of the best manga tutorials out thereTenko (天狐) from Hokusai Manga (北斎漫画) Manga is slowly becoming a universal expression, not limited to Japan only. M
Tutorial: How to draw manga expressions Joy and embarrasment :) By Mark CrilleyI will always love his style of shading. 
MangoSlice: a community for aspiring OEL manga artists!I wanted to especially recommend this beautifully constructed forum that serves as a learning resource, as well as a wa
Tutorial by Mark Crilley: How to Draw Backgrounds (3 Point perspective)There is a trick to it which will make your action scenes look deeper, with more thought to the page. If you master thi