I think the kitchener stitch is a PITA, so I use a three-needle bind off more often. It makes a neat, but not totally flat, seam. You have to have live stitches on 2 needles, and then another needle of that's the same size. It's good for sholder seams, I hear, becasue it is firm and not strechy (but Ihaven't finished a sweater up to the sholder seams yet, so who knows?)
Here's a link to a site with good pictures, but they are a bit dark.
Here's a link to amy's continental video, and here is a link to amy's english video. HTH