If you have an iPhone, odds are you’ve geeked out on apps. Even my 18 month old has some favorites (Peekaboo Barn is genius!). A year ago, we wrote about some of our favorite ‘green apps’ and mentioned that TreeHugger came up with a compelling list of apps that will help save gas, energy, time and money in four main areas of life: Gas, Driving and Car Maintenance, Traveling, Carpooling and Mass Transit, Home Energy Use, and finally, Greener Shopping. It’s time to add to that list.

Go Organic! [Free] finds organic grocery stores and Earth Day events near you. 

shopgreen: [$0.99] based on information you enter about your green habits, the app alerts you of promotions from local businesses.

MyMpg: [$2.99] helps you maximize your fuel efficiency. It evaluates braking forces and acceleration, tracks stats and improvement in gas mileage over time.

Green Lemur: [Free] offers advice on green tweaks, with a tip of the day on how to lead a more sustainable lifestyle.

iRecycle: [Free] provides information on where to recycle/dispose items. Choose from over 100,000 locations from coast to coast.

Yowza: [Free] finds coupons for nearby retailers that you present digitally rather than having to cut them out of newspapers and magazines.

[sources: EcoSalon,TreeHugger, Grist]