Instead of collaging a lot of photos, Darcy uses clear archival sleeves, which she pastes into the book. They come in all different sizes, so you can print out several of your favorite photos and then slip them into the sleeves.
Another trick: Instead of writing on the page of your actual scrapbook, write on a card and paste a picture in the middle, and slip that into an archival sleeve.
Make a color photocopy of the front page of the newspaper for the day you're scrapbooking about, and then shrink it down. On the opposite page, you can write things that were relevant on that day, such as popular songs and movies, world events, and trends.
When affixing photographs, avoid placing an adhesive in the center, as it can warp the surface and create craters. Try an invisible vellum tape, which adheres very well and barely shows behind sheer paper. If you do any writing, use a pigment ink rather than a dye ink, as it lasts far longer.