I searched YouTube for library promotion videos and came across this gem which is the director's thank you to her elementary school library. It brought a tear to my eye and reminds me of why I love this job.
With further searching I uncovered others created by school and public libraries for an "I love my library" contest sponsored by Thomson Gale with the winning entry shown at last month's ALA conference. See Gale's website for entries submitted by school libraries.
Great example of video booktalking posted by BookWink.com can be found on TeacherTube, an instructional video sharing site. Looking at the instructional videos made me think about creating videos on how to search the catalog, intro to the library, etc.