Makes a librarian very happy to read such posts
I mean about the reading, because as far as grammar goes, I recieved the 70's education which emphasized creativity rather than really learning grammar and punctuation. I remember when I got to college I was completely mystified when the English professor starting doing some cryptic looking diagraming on the blackboard???? I was robbed.
If you're looking for anything after your current book you might like:
"Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation" by Lynne Truss. It's supposed to be a lot more entertaining that it sounds.