Yes, this is the sew & flip method & is how I did my avatar. Many people quilt the center section of their quilt, then add & quilt the borders this way. I believe it's the old Georgia Bonesteel method from the 80's. If you are interested in other methods of QAYG, I would recommend the book "Machine Quilting in Sections" by Marti Michell. She covers lots of different methods.
http://www.amazon.com/Marti-Michell-...ng+in+sections
Also thanks for the link to the blog. She has some nice ideas.