Sure!
Here are a few others that are really helpful. I always have a few fingers on some of these the whole time I am making an art
(Again for PSP)
Zoom - g
Deform - d
Crop - r
Mover - v
Selection - s
Freehand Selection - a
Magic Wand Selection - m
Eye Dropper - y
Paintbrush - b
Clone - n
Color Replacer - , (comma)
Retouch - z
Eraser - e
Picture Tube - . (period)
Airbrush - u
Flood Fill - f
Text - x
Line - i