Roel has a great plugin, very simple wrapper around the Google Visualizations plugin that exposes all the plugin options as APEX declarative settings and feeds it JSON data from a SQL query.
I tried to take it for a spin here but the page comes up empty. There are 3 regions on the page. Before, Plugin and After but none of them show up! Even the developer toolbar doesn't show up.
View Source looks fine Not sure what's going on. Roel's demo page works fine.
Any ideas?