print "Move disk $num from $from to $to\n";
movedisks( $num-1, $aux, $to, $from );
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I jotted down the steps with 3 discs on a piece of paper and this is how I saw it:

$numdisks = 3
movedisks( 3-1, A, C, B) 
movedisks( 2-1, A, B, C) 
print "Move disk 1 from A to B" for the base case
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Shouldn't the last two statements be right outside the else block?

Neato problem, I didn't get it at first, but now I'm tempted to start my own 3-peg disc rotating habit. It all sounds very zen ;-)