I'm sure there are really useful ways to use MTurk. I'm quite sure even really innovative startup ideas.

Can anyone think of something?

We're actually taking a database from usda.gov and having MTurk write unique content for each item for our application.

There are several other sites that already rank well just by copying the same data. For a few hundred dollars we should be able to be very competitive.

It's interesting how you treat MTurk as a machine. I would have expected to read:

"[...] and having MTurkers write [...]"

Ha, busted. There is a cold anonymous aspect to it though. Unlike our future users who we will love and adore.