Without much fanfare Google launched a web app called Chrome Canvas. This web app allows you to doodle or draw in a web browser. Drawing options are limited to Pencil, Pen, Marker, Chalk and Eraser. Once you have completed your drawing you can then export to a PNG file. While it has no fancy drawing options, it is a quick an easy way to create and draw quickly without any software other than your web browser.
Give a try yourself!
Source: Google Canvas