I don't like the preloader -- how there's a huge black box moving from left to right -- because visually it's too aggressive. It's best to have a discreet looking preloader unless your website is about aggression (which I doubt with all those baby pics).
Thanks - an excellent point. Someone asked me to make a preloader for it and I went overboard, both with the color and the aggressiveness. I made a it slightly darker shade of green than the background. Thanks for the suggestion!
First point: I think a faster feedback when you click on an arrow would be helpful. At first I didn't think the buttons were working; then I realized that the photos were fading to black. Maybe it could just be starting your fade at a bit faster of a rate.
Second point: when I clicked on the blog button and the black screen filled with type, I assumed to click on it to get it to advance to the next point. What happened instead is that a new window popped up with the last photo I viewed in it (just like when you click the photo in gallery mode). You might want to think about shutting off the clickability of your window-launching button when the user clicks over to the blog.