Photoshop CS with multi-layered RAW photos, or just a lot of layers period, with Bridge running, etc., eats through 2 GB in no time. In fact, I've seen OS X utilizing over 6GB on our machine when my wife is working with complicated layouts / PSD files. Easy. And once you start swapping to disc, you know it! Our old computer only had 1.5GB and she had to be careful to only have open the minimum of stuff that she needed for what she was doing, and had to be selective as to how many brushes were pre-loaded, and so on. Now, though . . . she can do whatever she wants. Seeing 10GB on the system profiler readout for the first time was like a religious experience! I love having that much RAM. I myself would never use that much. My MBP only has 2 GB and it's enough. But I'm not a graphic artist / photographer either, though. How much RAM is "enough" really depends on what you're doing.