wSketch is a simple drawing and sketching application that turns your iPad into a clean whiteboard: a space to create and invent. Use colored markers to brainstorm, sketch ideas, diagram a new product, or just doodle. Save your work and share it with friends.
Flipswego write: Its plain and simple with room to improve. Only thing is there is no rotation to lanscape
Buckwheat Fujimoto write: A simple, but free ap that does pretty much what it says it does. Not elaborate, but useful for quick sketches or getting down simple ideas in a hurry. Think of it as a napkin at a restaurant, the one you write down that "big idea" on in the middle of a meal. I'd like to see a landscape mode.