WP-Media-SiteMap generate a sitemap of all your media content : images, video, flash animation.
It create a site map for each kind of file and a index sitemap to group them in one URL that the crawler are going to index.
You also have in page in the option to see details about the files which are generated and some basic errors detections
Please see this page for details about the installation process. Don't be afraid it is easy !
WP Media SiteMap installationv2.1:
Correct bug & in title
v2.0:
Video Sitemap + button to manually generate the sitemap
v1.0:
Basic feature : sitemap generation for images, "option page" to view details about files and some basic errors detections
v0.1:
Beta !