We have release version 1.0 of the Flickr Photostream Widget.
We wrote this Widget for a customer of ours. They have a large photographer blog and wanted the Authors Links to connect to their respective Flickr Accounts rather than the Author Profile, which is the default behavior of wp_list_authors() function.
Rather than linking to the authors profile, this widget modifies the link to connect to the authors flickr photostream. This was designed for photoblogs that have multiple authors/photographers.
If the shadowbox JS plugin is install the Flickr Photostream is rendered in a Lightbox, otherwise it will goto the flickr website. Uses the Yahoo IM account if in user profile, otherwise uses nickname.
This should be up in WordPress repository sometime tomorrow. You can find the plugin page here.