My favorite is making 8 at once, but now that I've seen how the Wonder cut saves effort, that will be my new method for making many HSTs.
http://www.wondercutruler.com/ruler.html
I currently am making a gazillion HSTs from precut 2 7/8 inch squares taken from cutting apart scraps. Tedious, but easily done. I would never do a regular quilt this way unless I only needed a few.