I know I've got like 1 post total here but I'd thought I'd mention this in case no one else had.

I have a Radeon 9800 Pro in my system. It works fine with Maya except for image planes. When you setup an image plane and then begin working with it, if you zoom way in on it you will notice it skews with respect to any geometry in the scene. The workaround that I use is to create a plane with my reference image as it's texture. The plane does not skew.

I don't know if this is a problem with all ATI cards, but I thought you might want to be aware of it.