Scriblink

Scriblink (3/5): Scriblink is an amazing tool, but it is not the greatest when you use it on its own. If they partnered up scriblink with a tool that allows voice communication (skype,google+, etc...) then it would be outstanding.

What scriblink does is allow students to do work together on a virtual whiteboard even though they are in different location. These tool would benefit students in the math and science department the most because it is very difficult to describe exactly how a molecule should look or what a graph looks like without pictures. The whiteboard allows the students to just draw it out for the others to see.
I would encourage my students to use this site for group studying when they are unable to meet up. Here's is a great example of how it works

A problem with this tool is that students can end up just doodling to each other.