"Well, this is something I find really promising: Nokia Handwriting Calculator allows you to calculate handwritten math expressions with a touch-screen Nokia device, and with a Windows PC. As such, the calculator really nice, but the really cool part is, in my opinion, the underlying handwriting recognition technology that enables us to create great new applications in the future.Download here. Please don’t mind the minor stylistic rough edges - consider this as an experimental technical showcase, and let the brilliant development team from Beijing know what you think about it!!" via betalabs.nokia.com