Well, I wrote it so someone could possibly do a semi-distributed exchange, with an escrow address along the lines of ClearCoin, but without storing any keys on the server.

I kind of imagine it going like this:

1. Seller lists a price on the exchange.
2. Buyer places an order.
3. Exchange gives each person the address and half of the key (deleting the original key and keeping only the buyer's half.)
4. Seller sends the BTC to the address.
5. Buyer sends the money to the seller using whatever the seller accepts.
6. Seller sends the other half of the key to the buyer.

If the money isn't claimed in like six months, then the seller gets it back.

I personally don't want to write an entire exchange, but I like the idea of having an exchange that keeps no funds and no keys for itself. It's not the completely distributed exchange that we all fantasize about, but it's better than what we have now.