Both the raw data streams in machine-readable format and the analysis / narrative layer involving 1..n people. Many jQuery solutions for graphing and plotting: jQPlot, Highcharts, Flot, jQuery Sparklines. But shouldn't we rely on Pachube in a first stage?
Architected for socialising around graphs and tabs: discussion, interpretation, comments, ..
Graphing tool from Pachube seems to be on GitHub: https://github.com/pachube/pachube_graph_library/blob/master/lib/PachubeGraph.js
Quite a bit of activity in the Cosm forums: http://community.cosm.com/forum/106 - get a file of what are people up to ..