I came across this great post called How to Break the Rules at the Book Cannibal. He lists all the ones I've heard before, as well as a few I haven't. The end of the article points out that some of the rules apply more to short stories, and that speculative fiction (i.e. sci-fi and fantasy) tends to be an exception at times.
I am writing speculative fiction, so one of the rules I've struggled with is not revealing too much detail about my world up front. I took a lot of the explanation out, but ended up having to put some back in because my readers were totally confused. Instead of a prologue, I now have a three-sentence Introduction which seems to be doing a good job of succinctly putting things into context before jumping into the action.
I really appreciate the advice about pleasing one person. I've had so much feedback from different people, that I feel both I and my novel are both being pulled in too many directions at once. As a result, the narrative feels choppy to me.
I've decided to take a break from feedback and just write to please myself first. I may end up completely changing the point of view, but the way it is now just isn't working for me. So it's good to have the reassurance to follow my instincts.
The rule I would break is the one about describing scenery. I re-read Tolkein all the time because of his lavish descriptions that pull me into Middle Earth. While I'm not writing as much of that as he did, I'm still describing things a little more than many of my plot-oriented friends prefer. But I feel it's important to establish the characters in their environment.
The thing is that the descriptions and world-building details that readers skim on the first reading, are the things they linger over on the second, fifth, and tenth readings. I want my story to be rich enough to keep bringing the readers back over and over.