Who or Whom? Who cares?

I get letters decrying the abuse of the English language - both through pronunciation and grammatical error. Language does evolve, and for better or worse it is looser and less structured than it used to be; I blame text messaging. For those who still care, Columbia Journalism Review’s language maven, Merrill Perlman, has created a guide to who and whom. I will be consulting it from time to time.