Homemade sound panels


In the mitts of making my own homemade sound panels.Was wondering if anyone tried this before?I have been doing alot of research on the subject but like to here from some excperience builders.Any tips on material used.Or any thing you whould of done different in your own designs..Any help would be great..
spaz
For bass traps, would I be better off with one, 4 inch thick panel (24" x 48") in each corner or two, 2 inch thick panels stacked vertically (24" x 96") in each corner? Or is there a difference?

Here are two links to DIY help:
www.ethanwiner.com/acoustics.html
http://www.bobgolds.com/
http://forum.studiotips.com/viewforum.php?f=8&sid=17689dd547daffa3ecfd9db0fe725313
I read somewhere that using pegboard acts like a resonator .With the hole's like bottle openings..The reason im using it is to keep the aurelex and the OC 705 seperate.The frames will be mounted about 3 inches of the back of the wall to let sound in from the back also..
Pegboard will only act as a resonator if it is free to resonate and not touching anything, except at the edges. The holes mean that it cannot be sealed and damped, which is not critical but helpful. The idea being that movement is disssipated into heat.

Cotton is preferred to synthetic.