I always used a scrap of fabric for a spider to keep my fabric from being eaten by the throat plate, so when I found Bonnie Hunter's site, i was all primed & ready to go. I try and have a stack of squares cut, or the cut off triangles from a project with 'flippy corners'. I have also cut a small quilt of repeating simple blocks, like 4 patches or HSTs, and stacked the pieces so they are ready to go. Even though I assembly line sew, it is still amazing how quickly those other patches are sewn. It's really like getting a bonus quilt!
I took a class from Bonnie and another way you can use this technique is when you have a pieced border. Cut the pieces for the border at the beginning of the project, use them for enders & leaders, then when the main portion of your top is done, the border is mostly assembled. She pointed out that lots of folks skip a pieced border because they can't face putting it together after spending all that time on the top.
Here's a link to her blog with the explanation:
http://quiltville.blogspot.com/2005/...-and-hows.html