I just watched Tapadero, a 2005 movie about the vaquero tradition in California. It is a very interesting video if you are interested in cowboy culture, old California and the vaquero tradition. It covers the history of the vaqueros from their origins in old Mexico through the Spanish settlement of southern California to the modern day. Detailed attention is given to the style of saddles, the making of riatas (lariats), the use of the bosal and spade bit, the methods of roping, and other details of vaquero life. Influential trainers such as Bill Dorrance are also featured.
This might be too much detail for someone with only a general interest in horses, but is very engaging for those with a special interest in the old Western traditions.
The video is nicely produced and packaged, and features a variety of vaquero-themed music in the soundtrack. It also features some amazing scenery from the old California ranches where the vaquero tradition developed and survives.