Use Dataloader.io to import / export data from Salesforce.com. What I specially liked about Dataloader.io is that it is entirely web based. Unlike Salesforce Apex Dataloader, you don’t need to install anything on your computer. Just go to Dataloader.io, login with your Salesforce credentials, specify the details and you are done. For free version of Dataloader.io you don’t even need to register with them.
Checkout this video how it works.