The Technically Sentient Newsletter goes out a few times a month.  It isn't on a specific schedule, but rather, when there is enough interesting information to make one worth sending, and I have time to compile it.

The focus of the newsletter is on Artificial Intelligence, Robotics, and Neurotechnology.  We cover research, products, and companies, with a focus on startups in these spaces.  Much of the newsletter is links to interesting things around the web, but it also includes original commentary and Q&A with influential people in these industries.

If you think this stuff is interesting, you should subscribe.