I just got my new Mitsubishi 65737 3D Ready TV, as well as two pair of DLP Glasses. The 3d effect works fine when playing Avatar the Game on PS3, but when using the Tridef software on my computer, the images and videos I load in the tridef software are not giving a 3d effect. I am using the Samsung DLP settings in the tridef software. The 3d effect appears like a checkerboard effect on the imagery instead. What settings or software should I use to get 3d working on my PC, and is there any content in 3d I can download that should work with my display? FYI my graphics card is ATI Raedon with HDMI out to the TV.

Go to the Ati catalyst control center and your display properties, try to tweak the overscan property.
DLP checkerboard requires pixel perfect transmission and does not tolerate scaling. Usually turning off overscan fixes the issue (overscan slider to 0%)