One of the features I wanted most for my locally stored photo reference library was to be able to bookmark images on the web, and download them locally. Also, I really wanted to be able to just grab any of my photosets on Flickr, and also store those locally, tags and all. Also, I wanted to be able to use imagecache & lightbox with these images.
Finally, after much futzing around with Drupal - I figured out how to do this.
* get rid of emfield - it is a pain to theme
* make image url field (just a simple link field)