Various philosophers' reactions to Anselm's argument.
http://www.fordham.edu/halsall/basis...m-critics.html
Mathematical deconstruction of Anselm:
http://brindedcow.umd.edu/236/anselm.html
And the best one yet:
http://www.uq.edu.au/philosophy/dsm/mannisongod.html#oa
Basically, Anselm's argument is a tautology. His argument presupposes the existence of that the existence of which he's trying to prove (how's that for an Anselm-ism!) and the argument basically breaks down to "If God exists, then God exists." Not terribly compelling.