I went the auralex route and was not overly impressed by it. While it did produce results, you really needed a lot to equal some of the other items available (or even DIY). I did not glue mine to the wall, I glues a small strip of thin wood to the back of the auralex and hung them from this strip, which better allowed for playing around with placement.
Kal (above) thanks for those links.
Kal (above) thanks for those links.