DL Image Manager (or DLIM for short) is an app that lets you manage all your different pictures stored on your phone, tablet or whatever runs Android.
It's made to be as fast as possible in moving pictures between several folders. To the right you have your favorited folders. You add them by going into a folder and press the star button. When long pressing a picture you start the select mode. Then it's just pressing several pictures and click on a folder at the right to move or copy them there. There are also actions for sharing the selected images and removing them.
All operations are done in the background so if you have lengthy tasks with moving several hundred images between different drives (storages), you can see the progress in the notification bar.
The app also has support for multiple storages on the Asus Transformer tablets so that you can access your usb thumb drive or external sd card.