Upgrade path: just disable and uninstall Workbench Files, and the install and enable the Workbench Media module.
Workbench Files provides some basic file management within the Workbench framework, by allowing users to see all files that have been uploaded to the site.
The module supports the link field. Thumbnails are generated via nivo-sliders' search and replace feature. In addition, a developer has multiple options for implementing custom javascript functions to change the nivo-slider behavior.
This module integrates the ImageFlow plugin with views. It has support for the link field. The customizable onClick function can be used to open links, images, or videos in a colorbox.