Open Mic: How Did You Soundproof Your Studio?

We're putting together a post on soundproofing a home studio, and would like to include as much of your advice as possible. How did you soundproof your home studio? Where did you purchase the materials? What plans do you have for the future? What issues need to be dealt with? What tricks and tips can you share?

Each week we open our mic to readers and lurkers alike to come out of the woodwork and tell us your thoughts and opinion, your experiences and mistakes, what you love and what you hate. We want to hear from you, and here’s your chance.