[Haskell-beginners] module path? qtHaskell examples?

Does GHC or GHCi let you specify the module search path via an environment variable? I notice it can be specified on the command line with -i. I don't want to type that every time, but I could always create an alias (or on Windows, a "macro") for running ghc/ghci. A second, unrelated question which I will put in the same email to reduce traffic volume: does anyone have working examples of qtHaskell programs? Thanks, Mike