How can I find which account I used for downloading my iOS apps? I use three different accounts for downloading from the App Store, each in a different country.

When there is an update, I have to connect to the correct App Store to download the update, but sometimes I can't remeber from which store an app was downloaded and so I need to connect to each one in turns.

I would like to be able to find the account I used to download an app so that I can connect to the correct App Store immediately. Also, this would enable me to verify if the app already exists in the App Store of my main account and buy/download it from there.
In iTunes you can simply right click the app in question and choose Get Info. On the summary tab you can see the account used to purchase the app.