The Hoogle web interface should have more bling, ideally Web 2.0 bling. In particular:

• Haddock documentation should expand and collapse.
• More results should just grab the additional results.
• When doing name searches, the results should come up as you type.

Can now be turned on with ?ajax=1, but not the default since there are lots of issues with it.

Further progress, Hoogle 4.1.4 has an "instant" mode which gives Ajax support. The main bit left is to revamp query support so that valid queries don't go through invalid ones.

The new hoogle.haskell.org does all this, and more, including "fixing" invalid queries.