FTR, I started playing with Haskell early 2012 and I have no idea what GOA is. All I ever see at my prompt is ghci.

If this is what GOA is, it actually sounds incredibly useful: http://www.haskell.org/haskellwiki/GHC/GHCi#GHCi_on_Acid. Looking up docs/source for modules? Enumerating typeclass instances? Yes please.