donnafreak - here is a link to the tutorial on doing the pinwheel HST's the way I described. This technique does give you hst's with two edges on the bias. if you've uncomfortable with bias edges (they don't bother me) then the link Mom3 provided above works for making 2 at a time. Let me know if you have any other questions.
http://www.youtube.com/watch?v=ekYpJzHoW6E