[Haskell-cafe] How to find consumer packages on Hackage?

Hi, I wonder if there is a (simple?) way to find out which packages use some package foo? The reason I would like this is that I am interested in using configFile in a project, and I would like to look at some example usage of it. So in my case I am interested in knowing what packages use configFile. I presume there is a generic way to find out.... Cheers Han Joosten