I came across this site and while I know there are tons of places to doodle on the web I really liked the look of this one.  The design of the site is what's so nice.  The colors and brushes are super limited, and I kinda like that. I also love that it will play back step by step what was done.  There is no control Z here, so if you mess something up you jsut have to go over it and keep moving on.  I never thought about how much I undo when I doodle on the computer.  Anyway below was the doodle I did today

If you want to start your own accoutn or just see all the other cool doodles people are doing head on over to sketch.odopod.com