foundmagazine.com is one of those unique sites that operates on a simple premise, but manages to be endlessly fascinating nonetheless.

If you've ever found a note on the street or in a park, meant for someone else, you'll know how intriguing such a find can be. Foundmagazine collects notes such as these, as well as photos, post-its and other curious items, and catalogues them on its website (www.foundmagazine.com is actually an online version of an annual magazine, which publishes a collection of the best finds from throughout the year).

From poison pen letters from scorned lovers to notes of apology from four-year-olds, they're all here. Some are heartbreaking, some are hilarious, and that's what makes it such compulsive reading.

An easy way to lose a few hours on a rainy afternoon.