please review my webapp: metracks.com
tripngroove: Regarding the UI: 
When the 'charts' to stack over the site content but are the same width as the rest of the site, it appears at first that one has navigated to a new page, which makes it even more confusing when you're trying to get rid of them. I think this is a counterintuitive piece of interaction that unnecessarily confuses the user. If there's no significant functional reason for the charts to behave this way, I posit that it's uselessly damaging the overall usability of your site. Just make them their own page.