Story here (with a link to the letter). One notable absence among the Yale faculty signatories is philosopher Tamar Gendler, who is also a Dean, and so presumably not in a position where she can take a public position on what may become a disciplinary matter under her jurisdiction. (I was not aware of this letter until this morning, though it is consistent with points I've already made.)
UPDATE: The affidavit from philosopher Christia Mercer (Columbia), now made public for the first time that I am aware of, is particularly damning.
ANOTHER: A couple of readers point out that Prof. Mercer's affidavit consists mostly of "hearsay," i.e., she is reporting what others asserted. (Formally, hearsay is an "out-of-court statement offered to prove the truth of the matter asserted," as distinct from live testimony from a witness with personal knowledge of the matter.) That is certainly correct. But hearsay evidence is relevant evidence, and sometimes highly probative, especially when it comes from someone like Prof. Mercer well-placed to have had access to those with reliable knowledge. One might discount a single piece of hearsay evidence, but here there are multiple pieces of such evidence, conjoined with a fact, namely, that Prof. Pogge was sanctioned by Columbia for some kind of sexual misconduct. (In most jurisdictions, where judges are triers of fact, hearsay is much easier to admit into evidence than in the U.S.--though even in the U.S., hearsay is frequently admitted--because it is assumed that professional jurists will know how to discount the weight of such evidence when appropriate. In this instance, given the source and the variety of instances, the hearsay evidence is clearly probative.)
I should note, since some have inquired, that I have not signed the letter (initially, I didn't realize new names could be added). I've already made clear here my views about the allegations on more than one occasion. In addition, I was put off by the fact that a quarter of the initial signatories were repeat players with a track record of reckless accusations who will sign anything, regardless of the merits; this is unfortunate, given that enough allegations in this instance are meritorious. Finally, the most significant fact about the letter was that it was signed by all but two of Professor Pogge's tenured colleagues in the Philosophy Department (one of whom, Gendler, had very good reasons for not signing, as noted originally); others signing at this point (when there are already 700 signatures or thereabouts) seems to me just piling on for no real purpose. The condemnation by his colleagues who are closest to what has transpired is sufficiently damning in my view.