Voice Thread appears to be a useful resource for displaying illustrations or pictures or graphs that have a lot of information embedded in them.
I'd like to try this out with various biological cycles--to check out how well it goes over: 1) one class to break up the class into groups, one for each cycle--variable sizes as some cycles require more work than others, 2) present info beginning at the end of the period or maybe the next class period.
Like a lot of these online resources, I will look for how much learning is accomplished for the amount of time invested. Of note are the multiple intelligences involved. Here's a class dissecting the carbon cycle that shows a number of students using sign language to explain what's happening as well.
At the moment, I'm not sure what I'd do about students who don't add much (or even add accidental misinformation or misleading information). Redo as homework? Probably. As a group, students should help each other and correct problems.