Windows only: Free application Tableau Public creates beautiful visualisations from your data and lets you publish them to the web, where uses can interact with your charts and graphs with live updates.
The video above provides a great overview of how the tool works. Essentially, you import your data into the desktop Windows application, then play around with different charts, graphs, or other options until you find the visualisation or visualisations that best fit your data. When you're happy with what you've put together, you can save the outcome to the web, which uploads the charts to the Tableau Public servers. From there you can embed it on any web page YouTube-style), and users can drill down into the data to their heart's content.
Here's an example of Tableau Public in action from a post on the Wall Street Journal:
Dashboard at 570
Tableau Public is a free download for Windows, and looks like a great tool to try out next time you're looking to make your otherwise boring data come to life.