10 Words You Need To Stop Misspelling --- Ok, it's not like I could post something from The Oatmeal in my classroom. Not exactly appropriate for 7th-grade parents (the students would be fine, I'm sure). But this tip on A LOT is priceless!!! I am making a poster of just that.
Here's an useful chart that summarises, very simply, how to use 15 punctuation marks, ordered by difficulty. This was created by Curtis Newbold who runs a blog called The Visual Communication Guy. Nice work, sir. Download the hi-res version here.