[rtcstudio]

Also go to www.auralex.com

They have a great online booklet called Acoustics 101 which is very informative to the home studio builder.

AND take advantage of their FREE acoustic consultation. All you have to do is download their form, sketch out your walls, ceiling, door placements etc. and fax it back to them. They'll have an acoustician fax you back suggestions for wall treatments etc.

I'm a big fan of their 2" and 3" foam as well as the Lenyrds, and diffusers.

Also, do a Google search on Studio Design. You'll find some interesting plans and suggestions.