Some pages from the wiki http://wiki.polycount.com/CategoryEnvironmentFoliage http://wiki.polycount.com/VertexNormal#Foliage_Shading Leaf density makes a big difference... http://www.unifycommunity.com/wiki/index.php?title=TreeCreator_Tutorial#Optimizing_the_leave_texture
Great tutorials. Added to the wiki. http://wiki.polycount.com/CategoryEnvironment#Environment_Workflow_.26_Modularity http://wiki.polycount.com/CategoryEnvironment#Environment_Texturing
A lot of my favs (and others') are in the Polycount wiki: http://wiki.polycount.com/2DTutorials http://wiki.polycount.com/CategoryEnvironment http://wiki.polycount.com/DigitalSculpting (I know, bit of a broken record)
A bit late to the party, but added your tutorials to the wiki. Thank you for these! http://wiki.polycount.com/CategoryEnvironmentFoliage http://wiki.polycount.com/GrassTechnique