Your data shows a 52% increase in the first half of the decade. Data from the census bureau indicates just over a 40% increase during that time, which is ~7%/yr. The biggest jump though is from 2003 to 2005, with an 11% jump in '04 and an 8% jump in '05. That was after a 3% jump in '01 followed by two 7% jumps. The correction brought the curve to a 3%/yr gain for the decade and it will certainly overshoot. Nevertheless, there's no doubling in 6yrs as that blogger's plot shows.
The first chart is based on Case-Shiller data. They have their own methodology on the calculation (Single family homes only; measuring repeat sales over a long period). I think it is more representative than just a straight median, but opinions will vary.
We can probably both agree that prices we appreciating at a much higher rate than the historical 4-5%, that it was unsustainable, and that there is more drop ahead to get bring things back into line.