What do you put in your newsletter?

Hi, everybody. I have a new newsletter on cyberfeminism, history, and thought traditions nurtured in the place where I am from. Working on it over the past few weeks has brought up a lot of curiosity about how others write and think about their newsletters. I read newsletters of course, but the ones I read tend to be more topical than the one I am writing. My questions are:

What's your newsletter about ?
How long have you been writing it ?
How often do you send issues of it out ?
Do you maintain any sort of public or semi-public archive of it ?
What purpose do you think of your newsletter as serving for you ?
If you have a blog, or have had one in the past, which format do you prefer ?
Will you add your subscribe page to my are.na channel ?

Link to mine for those who are curious!