Sage Ross, 16/08/2010 23:19:
The way Flickr does things is a good comparison. They have a "share this" pulldown, with options to share by email, share by long or short url, and HTML and BBCode for various sizes.
By the way, this was proposed (also) by Erik Moeller two years ago http://article.gmane.org/gmane.org.wikimedia.foundation/31977 during a discussion on hotlinking http://thread.gmane.org/gmane.org.wikimedia.foundation/31919
Nemo