Yep, the speed of the moon is quite amazing, you're constantly having to move with it's arc. I prefer a minimum of 1/125 sec at around f8.
As has been said and common to all long distance photography, but even more important here, the atmospheric polutants play a big part in a sharp image.
I'd also forget about trying to shoot 'big moons' that are low to the horizon, they pick up even more astmospheric rubbish.
Here's my favourite, when I (o.k. accidentally) got a airliner across the moon. In fact it's amazing how often you do see aircraft and birds crossing the face of the moon at night.
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