One of the online tools I go to when I need to differentiate with my higher kids or early finishers is prezi.
Prezi is a free web 2.0 tool (my favorite kind) and great for classroom use!
Basically, think of what would happen if powerpoint and a roller coaster merged...that's prezi!
Students can imbed videos, upload images or power points, change fonts, etc.
There are premade templates for easy differentiation and sharing is a breeze!
Try it now :)