Chogger is a new (beta) site for creating online comic strips. After giving it a try it happens to be one of my new favorite free comic creators. While it doesn't offer you all the bells & whistles of a paid app (Comic Life) it more then makes up for that w/ how easy it is to use.
Also, not only can a user create a custom drawing from scratch, they can add speech bubbles and upload photos as well.
I highly recommend checking out Chogger by clicking here.
For a more detailed review check out Free Technology 4 Teachers.