A couple of weeks ago, my life changed forever. No, I didn't dump my Nikons for some other brand. Never happen. There's not enough money in the world . . . No, I didn't leave my wife -- and she didn't leave me. It was a little more complicated than that. It was the day my new 15" MacBook Pro arrived, and it's presence has, for the first time in my computer life, made me a full-blown Mac computer user. I bought my first computer in 1989. An 8088 PC running MS-DOS. Monochro