If you used iPhoto when it first came out, you'll remember the way it slowed to a crawl once you loaded it with about 2,000 photos. Compare that to this year's model: iPhoto 6 can handle as many as 250,000 images and still have the power to run a host of suped-up features. Its new software engine lets you make changes with a drag & drop editing tool, find photos with a robust search feature, and manipulate images without affecting the originals in...