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You're going to want to sink some serious steel fairly deep into the ground to anchor your wall. In addition my dad and I always use extra rebar in the base and going up into the hollows of the cinder block. (Usually double the number required by code) Then we make sure to fill those cinder holes with concrete and use long pieces of rebar to slush the concrete down the holes making sure that there are no air bubbles by raising and lowering the rebar and refilling with wet cement until near level with the top of the wall.
I would definately have someone familiar with retaining walls and the requirements of your local soil conditions and geophysical properties (earth movement etc...) have a hand in the planning if not the building of a retaining wall that high.
We also make sure to use a heavy duty tar or like material to waterproof the inside wall of the retaining wall below the soil surface, and use the appropriate piping to provide adequate drainage. Overly wet soil really pushes against a retaining wall.
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"Remember, it takes two to lie. One to lie and one to listen." -Homer
Unless you are the freakin Highlander, what is the point in learning how to fight with a sword?
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