With the Move Tool selected, (V) use OPT/ALT+SHIFT+ any letter below to change a Layer's Blending Mode. These shortcuts also work for any brush-based tool with Blending Options. (ie: Brush Tool, Clone Stamp, History Brush.)
OPT/ALT+SHIFT+
Normal: N
Dissolve: I
Darken: K
Multiply: M
Color Burn: B
Linear Burn: A
Lighten: G
Screen: S
Color Dodge: D
Linear Dodge: W
Overlay: O
Soft Light: F
Hard Light: H
Vivid Light: V
Linear Light: J
Pin Light: Z
Hard Mix: L
Difference: E
Exclusion: X
Hue: U
Saturation: T
Color: C
Luminosity: Y
