I can claim one of the Columbia acceptances on the results page. Like sandmoon, I was the recipient of the email and the chair of the admissions committee was CC'd.
I would be doing PE, I think (though things are naturally still a bit up in the air at the moment).
Polisci over econ because of the research questions which interest me. Also find econ to be a bit constricting in terms of methods and frameworks.
Hi fellow discipline-straddler, I applied to Caltech SS and got the official decision (acceptance) on February 11. There have been some more informal communications (visit day info and such) in the days since.