Glimmer Train - long time home of incredible, award-winning short fiction...have you all submitted work to them? you really should - has a couple of instructive essays on their website at the moment.
First up, British author Rowena Macdonald's tips for writing dialogue. My favourites are: 2. Don't dump too much information in dialogue. In real life, we don't always helpfully explain what's going on AND 7. Don't be afraid to let conversations hang unresolved in mid-air and move onto another scene.
MFA director Josh Henkin explores the link between plot and character. Plot, he argues, is discovered by interrogating character: "My graduate students often tell me they have trouble with plot, but what they're really telling me is they have trouble with character. I remind my students to ask themselves a hundred questions about their characters. Better yet, they should ask themselves a thousand questions, because in the answers to those questions lie the seeds of a narrative." This is a truth I know and yet somehow often forget. When you're stuck on something, go back to character.