Picasa keyboard shortcuts for editing photos
Ctrl-3: Open an image in 'Edit Mode'
Ctrl-R: Rotate the image clockwise
Ctrl-Shift-R: Rotate the image counter-clockwise
Ctrl-Shift-H: Flip image Horizontally
Ctrl-Shift-V: Flip image Vertically
Ctrl-Shift-B: Add black and white effect
Ctrl-8: Add a star
Shift+Graduated Tint: Radial Tint
Shift+Heat Map: Night Vision
Shift+Vignette: Matte
Shift+Pixelate: Focal Pixelate
Shift+Border: Rounded Edges
More: https://sites.google.com/site/picasaresources/picasa/keyboard-shortcuts