I went to Carnegie Hall a couple weeks ago with my daughter's 2nd grade class and drew some of the performers in their Musical explorers program. No photography allowed, but I slipped in my drawing pad. You can view the whole set on my Flickr site. 
The education potential of the game Minecraft is immediately apparent when you first start dividing wood and constructing a crafting table in the game. MinecraftEDU.com has a mission to help educators bring the game into the classroom and to engage learners in what the game has to offer:
The game is being used to teach more than just computer skills. It easily lends itself to science, technology, engineering and math explorations (STEM). But beyond that, language teachers are strengthening communication skills, civics teachers are exploring how societies function, and history teachers are having their students recreate ancient civilizations. It is not an exaggeration to say that the only limit is imagination!They are creating a custom mod with features specifically designed for the education community and are making the game available at a discounted rate for schools. LINK: MinecraftEDU.com
A page from my sketchbook drawn while watching TV coverage of Hurricane Irene this fall. Click image to see full set.
Cartoonist Chris Schweizer has an informative overview of composition problems that can pop up when drawing. The Schweizer Guide to Spotting Tangents defines tangents as
...when two or more lines interact in a way that insinuates a relationship between them that the artist did not intend.Chris follows with a delightfully illustrated list of ambiguities that often appear when composing pictures. They apply as much to photography as they do to drawing and cartooning and can often be overlooked when making an image. LINK: The Schweizer Guide to Spotting Tangents
The web game Kikka contains a very simple set of puzzles: what actions do you need to take to bring 12 flower petals together and form a full flower? It offers 16 levels of very short interactions in a beautiful, minimalist interface.
LINK: Kikka
BONUS: Time 4 Cat 
Minecraft is a relatively new game for PC and Mac that allows users to build their own world out of virtual cubes that are 1 meter in volume. It differs from traditional first-person shooter games in that the environment the player inhabits is constructed on the fly when the player starts the game. The player "spawns" into a randomly generated world of mountains, lakes, deserts and caves which construct themselves based on programming algorithms. This means each player's experience is unique, and as they explore the environment the landscape builds itself out of thin air.
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Here's another online game that depends on drawing with your mouse to navigate through levels. Unlike Sugar, Sugar, however, Blipskrieg allows you to directly interact with the path of your player. You draw a trail for your "blip" to follow to the goal, dodging lasers and accumulating decoys as defense.
BONUS: Metallica "Blitzkrieg" 
19th century artist and instructor John Ruskin founded a drawing school at Oxford University in 1871. Oxford has now posted his collection of images, notes and instruction into an immense online catalogue. While much of the physical work has been dispersed around the world, the web allows the collection to be seen in its entirety, with information cross-referenced for ease of browsing. Oxford has also added contemporary interpretation of Ruskin's teachings, as well as short drawing instruction videos.
From the site:
He intended it not for the training of artists, but of ordinary men and women, who, by following his course, ‘might see greater beauties than they had hitherto seen in nature and in art, and thereby gain more pleasure in life’. His method required the student to master the rudiments of technique – outline, shading, colour – through a carefully directed course of lessons in copying both works of art and natural specimens.Link: The Elements of Drawing