Drawspace.com offers free online lessons for beginner artists on everything from shading texture to portraits to cartoons. Artyfactory.com is another free online resource that offers a wide variety of free online drawing lessons for people with no previous art experience. Thevisualinstructor.com offers free online lessons as well as video tutorials.
Drawspace.com has an easily navigable website that lists available lessons, which may earn aspiring artists credits towards receiving a Draspace Beginner Certificate. Lessons are taught by world renowned artists, teachers and authors. In addition to their online lessons, they also have a bookstore with a list of available drawing books that can be purchased and delivered.
Artyfactory.com is a free online resource where anyone can learn to appreciate visual art. According to their website's homepage, they are an especially useful reference for anyone involved in art education, from college-level art professors to home schooled students.
The final website, Thevirtualinstructor.com is an online art school that offers digital lessons in drawing and painting. Starting with the fundamentals of art, they then take you through numerous online video courses to introduce new artists to the basics of drawing and painting.
All three of these websites would be an excellent resource for someone who is interested in learning how to draw but also in improving their general understanding and appreciation for art.