Feature request:
bitcoinaverage.com has done a good job of aggregating exchange data and calculating weighted sums for individual currencies. They export a simple JSON API to retrieve the values, which update once per minute.
I'd find it very useful to be able to look at, say, the USD global average price (bid/ask/last) with the same charting display you use with raw exchange data.
Thanks for your consideration.
The help of global average is very limited. All large exchanges has "same" price. such as Mt.Gox has higher price because it is difficulty to withdraw. The only help is the trends would be much stable, panic sell or buy on an exchange would not affect trends too much. So it would be low priority feature.