Restoring and Repairing Old Photos

Over the weekend, I paid my grandmother a visit and as I was preparing to walk out the door, she told me that she wanted me to go through her cabinet and take everything in it with me. After a bit of sorting, I have found several really great family photographs that I plan to digitize, along with lots of other stuff I haven't gone through yet (like yearbooks, etc.). I'd like to repair the major cracks and a few other problems I've already noticed in these photos. Ideally, I'd love to end this project with some larger prints that can go on a wall, and so I'd love to start with the negatives, but those are long gone I'm sure.

I'm savvy enough to dive into Google and find some Photoshop tutorials, but I put much more stock in my fellow TDP community. So, does anyone have any good restoration tutorials bookmarked that they'd be willing to share? Thanks!