The switch from film to digital cameras has ushered in a new era of instant gratification: You can snap a picture and e-mail it to 10 friends in a minute or two. But too often, images languish, unseen and sometimes forgotten, in a desktop folder or on a memory card. With online photobook services, it's easy and fun to give photos a tangible (and well-designed) home. We tried five popular tools and created books that play to the strengths of each one. Whether there's a baby to celebrate or a vacation to remember, these personalized volumes make truly memorable keepsakes. Long-term gratification, indeed.