quilt as you go tutorials -round up / patchworkposse.com
Periwinkle Quilting and Beyond: Tutorial, How to make your quilt bigger when it's already been quilted
they can just be seamed together and the raw edges covered with a fabric strip, but I really like the end result with my method; it's very flat and the quilt has no bumps at the intersections of the seams. I first heard of this method from Queensland tutor Lyn Booth, but I do the cover strips a little differently than her.
detailed instructions on how to connect quilt-as-you-go blocks, using log cabin blocks (in this case)