The Billion Prices Project uses online data to measure prices on a daily basis. Their results closely follow non-seasonally adjusted CPI.
You can see the important influence commodity prices have had on CPI, but seeing as how those were, at least partially, a result of QE2* and still don't fully explain the rise in prices after QE2 I see this graph as another strong piece of evidence that QE2 worked.
I expect price increases to continue to moderate in the future. The economy still can benefit greatly from more aggregate demand.
*Commodity price increases as a result of higher world aggregate demand (QE2) are reflecting something good, price increases as a result of supply shocks (Libya) are bad. This is economics 101 but it is still very often misunderstood.