It occurred to me while I was reading the comment of Anonymous that it is an incredibly serious problem that no one is ever trained to write letters of recommendation. In large part, the problem is that people have very little opportunity to see such letters before one serves on a hiring committee, and it’s not so clear that people can pick up the necessary skills just from reading other people’s letters. There really needs to be a tutorial online explaining how to do so, hopefully with examples (obvious the examples would have to be hypothetical, but that’s fine).
I doubt that this will ever happen, but I thought I would throw the idea out there. You never know when someone might bite.