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.
Mallory says: AMAZING KNITTING SITE! Knitting video tutorials (and illustrations) from the COOLEST knitting site I've ever seen. Site design is awesome; video narrator voice is gorgeous. The site is trendy, youthful, and high-end.