AWeber posted an article – 3 Psychological Strategies That Help Reduce Unsubscribe Rates – about techniques on how to reduce unsubscribe rates.
I particularly liked the one of using Quit and Give Up as unsubscribe buttons/text.
Using your brand name on the subject seems to make sense, but I was a bit surprised to see how big the improvements were. (I have always used Starglider Systems News – Month Year as my subject)