If you want to see in realtime what's going on Digg you can use their digg spy page. This popular Digg feature uses a dynamic Ajax UI to let you see diggs as they happen. And now it serves as a model for a growing number of mashups that use web APIs to give you a realtime window into activity on a variety of services.
Can we exploit the extraordinary ability that humans have to read faces to make sense of abstract data -- by rendering data as concrete facial features? That's a question raised by a recent ProgrammableWeb Mashup of the Day Pubmed Faceoff.