about how to implement drawing? heres one idea...

http://www.devx.com/TabletPC/Article/22038

then there's also
http://artpad.art.com/artpad/painter/
http://artpad.art.com/?ij7tjsbzqqw

http://www.imaginationcubed.com/LaunchPage

QUOTE
Mac OS X and Grab

Macintosh computers running OS X include a screen capture utility called
Grab that is quite a bit more versatile that Print Screen. Grab is located
in the Utilities folder inside your Applications folder. Use the menus to
capture the whole screen or just a small section of it. You can even set a
10-second delay so you have time to arrange things on the screen perfectly!

You can also use keyboard shortcuts to snag a screenshot with Grab. At
anytime, press Command-Shift-3 to capture the entire screen or
Command-Shift-4 to drag with the mouse and select a smaller capture
area. Your screenshots will be saved as TIFF files on your desktop. To
save your screenshots to the Clipboard for pasting instead, hold down the
Ctrl key as well (e.g. Command-Shift-Ctrl-3).