Ask HN: Mailing lists that HN readers ought to know about?

I subscribe to a variety of information feeds through email mailing list subscription. There's at least one mailing list that seems to get my attention on a regular basis, namely that produced by KurzweilAI: http://www.kurzweilai.net

The mailing list seems to touch on cutting edge news across AI research and business.

What do you subscribe to that you think others would benefit by if they were to as well?