An example of knowledge visualization on the move 🙂 from Oxford, UK.
The period table is probably the most amazing example of knowledge visualization: it enables insights (indeed, to understand that some elements were not yet discovered!), offers overview-zoom, and details on demand (if you have an interactive version) as in Schneiderman’s mantra, it’s color coded for an easier navigation, and can also be used for visually pleasant marketing activities, as above!
Sabrina Bresciani, Ph.D. 
Can I stock those? Would really complement http://www.bytelove.com/stuff/lifestyle/periodic-table-shower-curtain/prod_238.html :).
Great stuff here lately and funny that you have discovered Prezi, great app and great ppl … many of them Swedes ;).