Would be great if it could take a little of the TabPad concept, which works in landscape / is made for honeycomb, has good drawing function and a great eraser. Faster too.... but can only share with facebook
MakeNotes (beta) could give some inspiration too with its auto shapes function.
Phone: HTC Butterfly S
Tablet: Galaxy Tab 10.1 (GT-P7500/p4)
Phone: HTC One X
Tablet: Galaxy Tab
Phone: Nexus One