Davide, thank you for suggesting this commentary. I will have to look into it.
For persons who are interested in the Rule of Benedict, but do not want to purchase a book, you may want to subscribe to a mail list which receives Br. Jerome's daily commentary. He is a Benedictine monk at St. Mary's Monastery in Petersham, Massachusetts (USA). Br. Jerome sends out the daily reading ,and his reflections on it, to several different mail lists such as Monastic Life (its a Yahoo group) or an international mail list for Benedictine oblates. Unfortunately, I can not provide links to these lists since I am new here.
Of course, subscribing to such mail lists will get you mail about more than the daily reading of the Rule and a commentary about it. So, perhaps that is not such a good alternative.
Okay, if you google
rule of benedict daily reading
about the sixth hit will be called "The Online Guide to Saint Benedict". It has the daily reading, and if you click on the left hand side of the page where it says "Daily Reflection" you can get a commentary on the reading.
I've mentioned "daily reading" several times in this post. Were you aware that the Rule of Benedict is read aloud to the monks (or nuns) in daily portions so that the entire Rule is heard three times every year? I would imagine that would help memorization, if nothing else!