What about MonadComprehensions, by the way? The way I see it, it's an even better fit for Applicative because the return is implicit.
Following a couple of discussions at ICFP I've put together a proposal for desugaring do-notation to Applicative:
http://ghc.haskell.org/trac/ghc/wiki/ApplicativeDo
I plan to implement this following the addition of Applicative as a superclass of Monad, which is due to take place shortly after the 7.8 branch is cut.
Please discuss here, and I'll update the wiki page as necessary.
Cheers,
Simon
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