TIP: Jump to a specific blend mode

If you want to change a layer's blend mode to a specific mode (without using the menu), here's the shortcuts you need to know.
Press Shift Option (PC: Shift Alt) and one of the following letters.

N = Normal
I = Dissolve
K = Darken
M = Multiply
B = Color Burn
A = Linear Burn
G = Lighten
S = Screen
D = Color Dodge
W = Linear Dodge
O = Overlay
F = Soft Light
H = Hard Light
V = Vivid Light
J = Linear Light
Z = Pin Light
L = Hard Mix
E = Difference
X = Exclusion
U = Hue
T = Saturation
C = Color
Y = Luminosity

from the Photoshop CS2 Help Desk Book