USA Swimming official videos for each of the individual strokes, the IM and relays:

Backstroke: www.youtube.com/watch?v=v5IjKFBIY18&list=PLJUznzZd1j8Urx4pxOW9gYFCzrWMb0jgx

Breaststroke: www.youtube.com/watch?v=6ZXUEfP-Agc&list=PLJUznzZd1j8Urx4pxOW9gYFCzrWMb0jgx&index=5&spfreload=5

Butterfly: www.youtube.com/watch?v=4ajQQQnSKQ0&list=PLJUznzZd1j8Urx4pxOW9gYFCzrWMb0jgx&index=6 

Freestryle: www.youtube.com/watch?v=baQJzcnG3oQ&list=PLJUznzZd1j8Urx4pxOW9gYFCzrWMb0jgx&index=4

IM: www.youtube.com/watch?v=6w452d_ZcAA&list=PLJUznzZd1j8Urx4pxOW9gYFCzrWMb0jgx&index=3

Relays: www.youtube.com/watch?v=BV2dAE0VXTE&index=2&list=PLJUznzZd1j8Urx4pxOW9gYFCzrWMb0jgx