My opinion is, hands down the Nifty Notions ruler for Half triangles is the quickest and easiest way to make half square triangles.
http://www.pineneedles.net/store/pc/...3&IdCategory=0
Also here is a blog that has a tutorial on how to use it, and some other information that is helpful:
http://emsscrapbag.blogspot.com/2008...y-notions.html
$10 saves you a lot of time, not to mention fabric.
But like anything you might need to experiment to see what works best for you.
Hope this helps!