I don't want to get all grammatically prescriptivist on your neighbours' asses, but "whom" is not posh for "who". On weekends I dress up in a moustache and trilby and wander the countryside militating for the Keep Whom Alive Society; nonetheless, even I - yes, I - would rather see "whom" fossilised forever in the peat bog of dead English than watch it writhing in the throes of unschooled abuse.
Remember: "To whom should I bequeath my trilby? Should I bequeath it to her or him?", but "Who is that stealing my trilby? By Jove, I think it might be the milkman!"
P.S. I know, what with the conversational tone and the direct commands and all, that it looks like I'm talking to you, comrades, but actually these paragraphs are for the benefit of the young scholars, who, here's hoping for all our sakes, never find their way hither. God bless 'em. Come to think of it - whom am I kidding? - they're for my benefit, aren't they? This is one of those moments, self, where we realise it's just me, and me, and those good old objective relative pronouns.