Instead of knitting two together immediately, I like to slip the first stitch, as if to knit, and then knit two together through the back of the loops. When I get to the last three stitches, I knit two together and then knit into the back of the loop of the last stitch. For all purl rows slip first stitch as to KNIT and then continue in purl.
By using this method you are eliminating the saggy baggy ends that can sometime occur. This method would be especially useful for the inexperienced knitter, where the tension is quite often a bit iffy because of inexperience.