This app is free to download and less than 6 megabytes in size. It's designed for the iPhone or newer model iPod Touch with a camera, but also works on the iPad. In order to use it, you will need to sign up for an account at www.1000memories.com, but that's free and quick.
To 'scan' in your photos, all you're really doing is taking a picture of them. It's best to put the photos on a surface with contrasting colors, like a dark wood table for lighter color images. This is so the edge detection software can pick up the borders of the photo. If it doesn't, you can always drag the little pointers around to get it just right. The software will then crop your image and upload it to the 1000memories.com site.
For each image you process, you have the option to include info like a caption, the date it was taken, or the location. You can also choose to make the image private. If you don't make it private, then the photo could be publicly accessible. The images can also be shared to Facebook or Twitter, but only through the website.