One place where you may notice that lets are used is when you have a
bunch of instance variables that depend on other instance variables for
their definition. For instance this code (not checked, posting from
wife's OCamlless machine :()

class foo = object val s = "test" val l = String.length s end

won't compile because of the dependence of l on s.

This example is clearly contrived, but if you do GUI programming this sort
of situation occurs frequently.

-- Brian
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