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Lisp

supacond: This is in the spirit of lisp's built-in cond macro, but the supacond macro expands into the creation of a scond object. The main data structure of the scond is a list of sc objects, where an sc is a pair of closures (one for the predicate and one for the consequent expressions). Each sc also has a count associated with it. Every time a given sc's predicate returns a non-nil value, not only is it's consequent set of expressions executed, but it's count is incremented as well. After a specified number of iterations, the list of scs is sorted based on these counts such that those predicates that returned true more often will be tested first. A short paper regarding these objects and their implications can be found here. NOTE: I wrote this draft before I realised what supacond really was, before I knew how it ought to be classified. Recently, I was leafing through "Machine Learning" by Tom M. Mitchell. The first sentence reads, "The field of machine learning is concerned with the question of how to construct computer programs that automatically improve with experience". It appears that supacond falls under this category.
Here's the code
You might use it in the following way:

	    ;; initialize
	    (setf my-scond (supacond ((> foo baz)
				      (do-something))
				     ((< raz mataz)
				      (do-something-else))
				     .
			             .
				     .))
	    ;; later you could execute it as such
	    (scond-eval my-scond)