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AFAIK, the only way to correctly determine when to who vs. whom, is to use grammar rules that don't really exist in the English language (unless you're a linguist). Native German speakers get this right by intuition, because German does have those rules. It boils down to whether the pronoun refers to the accusative object ('who'), or the dative object ('whom'). Here's a really bad analogy for us geeky types: Using the C++ or C# member access operators, . is 'who', and -> is 'whom'. A better example would be the sentence "Who did what to whom?". Commence flame wars re: ...but isn't "Who" in that example actually the subject (in the grammatical sense)?
Eagles my fly, but weasels don't get sucked into jet engines.