How to Create a Drawing App with HTML5 Canvas

William Malone has written a great tutorial: Create a Drawing App with HTML5 Canvas and JavaScript, that will take you step by step through the development of a simple web drawing application using HTML5 canvas and JavaScript.

The aim of the article is to explore the process of creating a simple app. You will be able to learn how to draw dynamically on HTML5 canvas, the future possiblities of HTML5 canvas, and the current browser compatibility of HTML5 canvas along the way. You can also download the HTML5 Canvas Drawing App in .zip format.

Source: Create a Drawing App with HTML5 Canvas and JavaScript