[buddyboy1]

So I have been thinking about enhancing the acoustics in my room for music listening and I have a couple basic questions about acoustic foam and treatment.
 
Where are the most important areas to have acoustic foam?
I am a DIY kinda person and am wondering if there are any kind of DIY acoustic foam/bass traps threads or links around?
What are some good and reasonably cheap acoustic material to use?
I came across this stuff, it seems like it would be nice to go behind the computer desk/speakers, but I have no experience with anything of the sort.
 
Thanks for any and all help.

 

[Subsequence]

I suggest having a look here for very good advice and quality dampening material's, they are very helpful as well if you have any question's.
 
http://www.gikacoustics.com/