I installed cellulose insulation in my attic last year. What a difference it has made in lowering my energy bills!
Now planning to install cellulose in the walls for a total solution for my 1930's house. Looking forward to even lower energy costs and the sound deadening effects.
I live in Florida and am amazed at how many friends and neighbors don't have any insulation (or very little) in their homes. They are pouring money down the drain every month!