IBM came out with a new site called Many Eyes and it is really cool. The visualizations are quite impressive and the charts are very interactive. There are also numerous interesting chart styles.
I did not notice what features they have for updating datasets once you have uploaded information onto the site. I also could not tell to what degree it allows for collaboration between datasets posted by different individuals. Automatic updating and collaboration between datasets are two features (with patent pending) on data360. Another unique feature of data360 is its custom reporting capability, so that you can combine graphs into a pdf report.
Bottom line is that IBM’s graphs are totally cool and visually very appealing. It is very interesting and worth checking out.