The simple site sends you an email every morning reminding you where you were. It's a fun way to relive good times and is even encouraging me to check into places more often for posterity's sake! Foursquare fans, check it out at 4squareand7yearsago.com.
If you're an avid Foursquare user who's had an account for at least a year, you can find out! 4Square&7YearsAgo is a simple site that uses your Foursquare check-in data to remind you each day of what you were doing the year previous. A year ago today I ate Mexican food and drank a margarita at a favorite neighborhood spot (perhaps a day late celebration of National Margarita Day?).