Online Whiteboards

Online Whiteboards are very useful as they can be used on your computer, laptop, or smartphone to easily draw sketches, collaborate them with others, and share them around the world.
One of these online whiteboards is AWW or a web whiteboard.  This one is very basic as you only get to choose your pen color and thickness.  Yet this could be very useful if that is all you need to write or make a sketch because it's very simple and easy to use. 
A more complex online whiteboard is Dabbleboard.  This site helps you visualize, explore and communicate ideas.  With Dabbleboard you can make shapes, textboxes, and free-hand any drawing you'd like.  You can replicate anything you've made as well.  It is fast because you don't need to spend time constantly changing the tools on your toolbar.  It is flexible becaue everything you make can me moved, resized, deleted and replicated; even your free hand drawings.  You can also re-use previously made drawings from your library and copy it do your current drawing.  You can also share your drawing around the world. 
Another online whiteboard is Scribblar.  Her the users can collaborate on their own online whiteboard.  You can make lines, write text, shapes, and more.  Images can also be uploaded and you can edit them and others can comment on them. Also, there is a chatbox to communicate with other users, and a voice chat could be used as well. Scibblar is very useful for shared writing, and it is handy for teachers to upload images and ask students to analyze them.  All of these online whiteboards are free as well.
  I personally like Dabbleboard the best, because it is quick and efficient and there are alot of options.   However, each online whiteboard has its own positives and negatives, and each can be used for different circumstances.  AWW is simple, Dabbleboard has a large variety, and Scribblar is good to communicate with others!