Well, I just got done installing a bunch of Acoustic Sciences stuff: 20″ SuperTraps in the corner behind the right speaker, Half Rounds in the little hallway leading to my bedroom, and another Half Round between the speakers, four PCAD panels and one MatrixPanel behind the listening seat on the wall, and another MatrixPanel on the wall over the record cabinet (first reflection point). This is only part of the stuff ASC came up with in their free design for my room, but it was all I could afford.
Really a major upgrade in the sound. Definitely a bigger improvement than 5 power cords (about the same price, too). So yeah, I feel silly not doing it sooner!