splityarn calls this the "Easiest Knitted Sweater Zipper Install Ever" and it looks like it might be. I haven't tried it yet but I'll let you know if I do - my one attempt to put a zipper into a knitted sweater came out OK, but not this nice.
Free Pattern - Crochet Snowflake Hotpad Potholder dishcloth (there is a link on site to Ravelry and a link there to another site for pattern). Great idea for little gifts for next Christmas. Even for teachers, maybe.