When would I feel a difference between 512 MB RAM and 1 GB RAM? Is there only any point to getting the 1 GB of RAM when I'm using heavy duty software, like Photoshop CS 2 AND 3DS Max at the same time? Or Photoshop and Mathematica? etc.? Since I mostly just do programming, but a little bit of Photoshop? I hear that the Mac OS X is really RAM hungry, and feeding it more would only increase the speed dramatically?