Collection framework

Hi everybody, is there a Haskell collections framework suitable for practical use? I searched the Net and didn't really find anything. I'm growing tired of remembering the various (and partially inconsistent) function names for lists, sets, finite maps, arrays, ... For starters, take lookup and lookupFM, which differ in argument order. Such a framework will probably have to use GHC extensions (Collects c e | c -> e), which is fine for me. If there is no such framework, it is high time to write one! Best, -Stefan