http://www.freejazzlessons.com/ A great website that provides exactly what it says, totally free video jazz lessons. Well worth checking out for keyboard tips on chord voicings and jazz playing in general.

Cool
It even includes a lesson on LH jazz rootless chord voicings:
http://www.freejazzlessons.com/category/left-hand-voicings/

I am guessing you didn't mean to give your posting the thumbs down icon when you posted it lol.