If I have to make a small amount of the lovely little buggers I do that line down the middle and love Eleanor Burns square up ruler.
If I have to make alot of the lovely things I use Debbie McCaffey's system of using bias strips, especially if they finish 3.5" or less. The book is call perfet and painless half square triangles. I took a class from Debbie last fall and just finished a quilt using her method. I needed 800 some HST. Here is a pic of my finished quilt.