There are a ton of things you can do with your digital photos and a photo editor besides just adjusting light and focus. You can make them into movie stills, or turn them into Lomo works of art. I happen to like the aged look, and it's always fun to turn them into Polaroids, but if you aren't using Poladroid, this can take forever to make the effect yourself.
But whether you use effects in Photoshop, filters in iPhoto, or mess around with levels in Lightroom, there's no faster way to age your pics than with this website. It's a Japanese site that lets you upload your digital pics, and in seconds spits out a 100-year-old identical. It's fun, fast, and gives you some cool digital pics to show off to your photo-loving pals.