You've discovered what most already know. Room lighting is one of the many subjects covered in the Video Essentials disc. Check it out for further tips!
Tip on room lighting
I have a 60" tv with a protective clear plastic screen over it. No matter where I put my light I could see its refection in the screen. After several attempts to move it I put it behind the tv. I cant stress what a difference this made to the quality of my picture. Better colors, blacks, and a much better depth of field. It works so good I thought I would pass on the usefull tip.