A bunch of brief, mostly unrelated thoughts:
Regarding Iago, I've played him and it is really fun. The last scene was particularly great in my experience, largely because I was working with a really good Emilia. The Roderigo scenes are great too.
Falstaff is one of my favorite fictional characters, if not my absolute favorite, based only on Henry IV part 1. I haven't seen or read part 2 or The Merry Wives of Windsor.
I recall hearing a recording of the sleepwalking scene in Macbeth when I was ten, and it scared the hell out of me at the time, although I'll grant I was extremely wussy then.
King Lear made me cry. Particularly the point where Lear enters with Cordelia in the last scene. In fact, I'll admit I'm tearing up now thinking of it.
The first couple ballads Autolycus offers to the Clown in The Winter's Tale really need to be made into actual ballads.
I do not like Orsino. I love the play, but Orsino needs to let go already, and cut out the "noble, spurned lover" act. He also needs to stop listening to so much mournful music and calling it "the food of love," mostly because I think there are many other lines that deserve much more fame than that one.
Speaking of quotable lines, people need to learn what "Wherefore art thou Romeo" means. I'm also told that people often quote Richard III's line "Now is the winter of our discontent made glorious summer by this son of York" (I think that's what it is, I'm too lazy to check), but leave out everything after "discontent." Gah.