The leaderboard has now been changed to show a sliding 7-day scale of points earned by you and your pals. Checking in now sets off a number of potential points-earnings actions. Trying new places, a new restaurant, meeting old buddies, getting a group together-all these things that might seem like nothing to you could actually be earning you points on the upgraded Foursquare.
At the heart of the application is the ability to get special treatment from a merchant who-thanks to Foursquare-now recognizes your loyalty and the amount of time and money you spend at their location. Foursquare is going beyond rewarding the Mayor and his friends. So later this week, merchants will be allowed to offer specials to swarms, groups of friends, regulars, newbies, Mayors, or everyone. And listed on the Places screen on the app will be all the Specials nearby which makes it easier for you to find where you should go to take advantage of your Foursquare status.
In addition to the 3.0 upgrade for iOS and Android, BlackBerry users will get an upgrade this week which will not include the 3.0 improvements, and the company hopes to have the 3.0 upgrade soon for Symbian and Windows Phone 7 users.
source: Foursquare via AndroidandMe
Explore finds places for you to, uhhh...explore, based on your likes and your friends preferences
The leaderboard uses a 7 day scale of points earned by you and your buddies
The Places screen shows specials available to you, that are nearby