alright, I use to be able to do this. In blender 2.49 I think it was pressing f in texture paint would let me select specific faces to paint, in 2.57 it just resizes the brush. I have no clue what this feature is called. could you tell me the new hot key for this?
In the header of the 3D window, when you’re in texture paint mode, there’s a little button that looks like a cube with a checkerboard on it. this will activate the function you seek. to select the faces you need just tab into edit mode i think.