Also, under Addons in Preferences, you can find the Import-Export: Import Images As Planes. With this extension, you can import images automatically as planes, and set specific material presets, such as transparency.

https://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Add_Mesh/Planes_from_Images

This is available in the Addons of all new releases of Blender since 2.6.

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