Check out MarketVision's Interactive Inflation Map for June 2011, according to data released today.
Quick Note: What is this "Inflation" thing?
Skip if you know about the WPI and the concept of inflation.
Inflation data is released monthly. Today's release was a provisional estimate for Jun 2011. They will revise it two months later, in September (along with the release of August provisional data).
Inflation is calculated based on the wholesale price of certain elements, which comprise our usage (supposedly). The Wholesale Price Index (WPI) is a basket of these elements, weighted appropriately. So the price of onions (1 kg worth) gets a weight of 0.17% while crude petroleum price will be 0.90%.
The basket is hierarchical - so Onions is grouped under "Vegetables", which comes under "Fruits and Vegatables" which is further under "Food articles"->Primary Articles->Overall WPI Basket.