Recently, a friend, Ale, told me about another online drawing program at NewHive.
Drawing Board is pretty rudimentary--no levels, no image upload and no erase (unless you want to clear and start over at the beginning). Just some brushes and colors.
Still, it's fun. I like the squares brush, and think the program is worth a try just for that. While I won't be switching away from Scribbler Too, I'll keep my eye on this one and see if gets any improvements.