If you want to help the new search engine Powerset (preview) get built, check out Powerset Labs, opening up today. It lets you play around with very narrow "corpuses" of knowledge, one of which is quotation database from Wikipedia. As you use the demos, you get to feed data back into the system to help the team tweak the engine.
This is a very eagerly-anticipated search engine, but these limited Labs demos, while very cool, don't guarantee that the full general search engine will be as good as they are. Definitely worth experimenting with though -- it really does look like a better way to search.
Powerset is demoing at the TechCrunch 40 event today.