Flame

Flame is an online java-based drawing tool by peter blaškovič that lets you make spectacular drawings with very little knowledge. Try it out!

(From Kottke)

Harmony

Harmony is an online drawing java application by Mr.doob (Ricardo Cabello) that allows your sketches to look all tricked out with shading, and fur, and circles, and other odd brushes.

The metafilter post about it claimed it made your shitty drawings look less shitty. This is a controversial statement, but it did bring me joy.

Enjoy!

(From Mefi)