Scriblink

Scriblink is similar to Draw to. Scriblink is an online white board. You are able to make a graph, you can write words, change the size of your marker, the color of your marker, you can upload a picture to color, you can type words, and even change the color of the board. you don't need to sign up. Scriblink is free.

You go to Scriblink at http://www.scriblink.com/

Draw to

 Draw to is a simple website that allows you to draw with your mouse. You can draw anything you like and then share it instantly with e-mail, Facebook, twitter, and other social networking sites.  You can draw anything that's on your mind, Draw to is basically an online sketchpad! There are apps you can add to your IPhone, IPad or your IPod touch. You can even add drawings to your blog! Draw to is 100% free, and you don't have to download it!
Draw to can be found at http://draw.to/new