Hyperquilting is done when you first stitch a feather (or other design) and then go back and add in another thread color on top of it. It's a lot of thread, but the results are amazing! As you can see from the photo on the outside of her book the feather was quilted in pink thread, then stitched again in gold thread. The outside is also echoed in purple thread. In stitching my own hyperquilting, I found that this outside echo was essential.
Here is Blog Quilt #2 with it's round of hyperquilting. I did the quilting in Glide by Fil-Tec thread and Fufu thread. It really helped the quilt sparkle once I added in the echo quilting around the edge.