I was about to post about it when I discovered it has been deleted twice already. While I understand the reasoning, I feel it's important to have a place to discuss the letter and its responses, especially considering many of its signatories have been posted about on Metafilter positively in the past. Ignoring this letter because of how "sucky the sucky stuff is" contributes to hide their willing participation and endorsement.
"What I wish I could do is take our tens of thousands of nice registered subscribers and offer them a Metafilter-style community." --Paywalls, Blogs, Comments, Editing and Magazines: A Conversation with Paul Ford, Web Editor of Harper's Magazine
From this week's Harper's magazine email, there is a mention of metafilter (more inside).