Here is an example of what can be produced on SpicyNodes:
They are really cool and get your attention in a better way than asking the students to do it on paper. To me they seem similiar to the Prezi's- just visually more interesting. This is a fun way to get the students to "brainstorm" on any topic/subject area.
I am definately looking forward to trying this out with my students next year- I think they will have a lot of fun with it.