Story Top is a good web-based tool for creating digital stories and comics. Story Top features an easy-to-use drag and drop tool for creating your story. To use Story Top simply select your background, characters, and text bubbles from the menu and drag them into your story box. After selecting the basic story elements you can then add additional elements like plants, animals, and vehicles. When your story is complete you can save it in your Story Top account or send it to friend. You can also share your story with a group of other Story Top users.
Pixton is a comic creation tool that has been passed around the education blog-o-sphere quite a bit lately. Pixton has a drag and drop interface which allows anyone regardless of artistic ability to create comics. Recently Pixton introduced Pixton for Schools which allows teachers to create private rooms in which only their students can create and share comics. To learn more about Pixton, watch this short video.
Some practical examples of how teachers teach problem solving in Singapore. Not a comprehensive set of directions, but does contain some of the problems you might choose and some questions to ask. Worth a read
Great set of tools available online for free. I played with several and really like the ease of use, the nice conceptual nature of them (i.e. archimedi's bathtub is a great example of a graph that could be used to help students understand change).