Alexander Street Press provides hundreds of hours of dance performances (ballet, tap, jazz, contemporary, improvisational, etc.), interviews with dance figures, and technique classes. Make sure to check out both volumes of this database:
OntheBoards.tv * has cutting edge, contemporary dance videos. Completely unique content.
Dance in Video I * has over 500 hours of video.
Ethnographic Video Online * is intended to be a visual encyclopedia of human behavior. Includes videos of dance. Searchable by keyword, geographic location, cultural group, and subject of the video.
Numeridanse.tv has over 1700 freely available, high quality dance videos. Many are European focused. Some documentaries and educational resources available as well.
Jacob's Pillow Dance Interactive is the online archive of many of the performances performed at Jacob's Pillow throughout its history. Includes performances by many monumental dancers and companies of the 20th century from all genres of dance.
New York Public Library Digital Collections has recently begun to digitize and make many of their unique dance films available online previously only available by visiting the Jerome Robbins Dance Division reading room. Alert - some videos may only be viewed from computers in NYPL. These are indicated with a lock symbol. They can be excluded from your results by toggling the "Exclude Location-Restricted Videos" button.
Dance-Tech TV offers unique videos focused on the intersection of dance and technology, both performances and talks.
Dance Channel TV provides a couple hundred unique and high quality dance videos. Offerings focus on ballet, a Meet the Artist series, and dance documentaries.