I use Eleanor Burns Quilt-in-a-Day method and I have her triangle square up ruler and it is wonderful. I was making a hugs and kisses quilt which called for lots and lots of half square triangle blocks and this method and ruler worked wonderful. I was finished with the the quilt top in just one day (50 x 60).
Following is a link to some of her videos. They show several ways, but the American Barn series uses lots of half square triangle blocks.
http://quiltinaday.com/theater/qbab/qbab1.html
Cherry