http://www.eproductwars.com/dvd/
The problem is their data is not the best. Amazon keeps selling out of Blu-Ray titles so they never have a chance of climbing the charts. The best thing to do on the site is look at the longest time frame. You can clearly see how Blu-Ray's stock is up.
Here is another:
http://www.dvdempire.com/
Click on the "Blu-Ray" menu item across the top and look at the upper right corner.