If you are an iPhone, iPad or touch user and are partial to purchasing reasonably priced apps there is a great one made by the NZRU which is called New Zealand rugby skills and drills. For NZ$5.29 (roughly comparative at the moment) you can download an app containing over 400 drills and skills for under 7′s through until seniors.
Here are some general youtube search site links:
http://www.youtube.com/results?search_query=rugby%20coaching%20drills%20&sm=12
http://www.youtube.com/results?search_query=rugby%20coaching%20drills%20breakdown&sm=12