Hi Christine,
I couldn't find the exact chart you were looking for.  There are similar pricing charts that you can find by doing an internet search for "Disney World price seasons."  I tried, and an extensive list of sites came up providing me with the information I was looking for.  
Having said that, you can get specific pricing information for each individual resort, and a list of all of the different pricing "seasons".  When you go to the page of a specific resort, like 
Animal Kingdom Lodge, there is a menu on the left hand side of the page.  Select "Room Types and Pricing".  
You'll immediately see the dates listed for 2012 Value Season - Weekday, but on the right hand side of the page you'll find a menu that contains every event at WDW.  You can compare pricing for weekday vs. weekends, check out the rates during marathon weekend, or even find out how much a room costs during Thanksgiving.
Hope this helps.  Have a magical vacation!