New Plugin: SuperSlider-Image

Provides a shortcode for adding images to your post. Provides an easy way to change image properties globally. At the click of a button all post size images can be changed from thumbnail size to medium size. Changing any default option in the admin/settings/superslider-image page will change that property for all images inserted with the [image] shortcode.

http://wordpress.org/extend/plugins/superslider-image/