Has anyone tried this yet? Unfortunately it's Mac only. Software costs 50 bucks and ideally you have good iPad stylus. It basically allows you to use your iPad as mini Cinitiq, and it's especially designed for drawin.
http://astropad.com/
I really hope they make a PC version.
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Air Stylus is similar for $20.
https://play.google.com/store/apps/details?id=com.sunnysidesoft.VirtualTablet&hl=en