[Haskell-cafe] Combining computations

If you look at this stuff long enough it almost begins to make sense. Maybe. ;-) I've been messing around with MonadPlus and I understand its usage with the Maybe and List monads. Since one use of Monads is combining computations, how can I combine a Maybe with a List? let m1 = Nothing let m2 = [1] let m3 = m1 `mplus` m2  ==> [1]    --if the Maybe is Nothing, do nothing  let m1 = Just 1 let m2 = [] let m3 = m1 `mplus` m2  ==> [1]  --if the Maybe is not Nothing, add it to the list Or am I misunderstanding combining computations? Michael