Many Eyes is interesting data visualization service just released on IBM’s alphaworks. You can upload your own data and generate and publish a visualization of it in a number of formats. As an example, see 100 most popular Semantic Web namespaces as of August 2006 according to Swoogle. The site is similar to Swivel but has more ways to visualize your data. Many eyes also a rudimentary social media site in that people can comment on uploaded datasets and visualizations.