Balsamiq Useful shortcuts

/ - Quick Add
Hold Shift while resizing - Maintain aspect ration
Hold Command while moving object - Removes snapping
Shift + Direction while an object is selected - Moves object faster
Command + Alt + (Shift) + Direction while an object is selected - Resizes object
Command + Up/Down - Moves selected layer up or down 1 level
Command + (Shift) + Up/Down - Moves selected layer to top or bottom layer
Alt + Drag object - Duplicate object
Shift + click another object - Add object to current selection
Command + click another object - Add object to current selection
Alt + drag selection box - Select objects while ignoring other objects behind them.
Command + 2 - Lock object
Command + Alt + 2 - Unlock everything
Right Click Object - Individual unlock
Command + G - Group selected objects

ALIGNMENT

Command + Alt + 1 - Align left
Command + Alt + Shift + 2 - Horizontally align center
Command + Alt + 3 - Align right

Command + Alt + 4 - Align top
Command + Alt + 5 - Vertically align cenger
Command + Alt + 6 - Align bottom

ZOOMING

Command + = - Zoom in
Command + - - Zoom out
Command + 1 - 100% zoom
Command + 0 - Full screen zoom