I'd be interested to see some examples of Bitcoin contracts used right now.
- Websites that provide escrow services.
- Smart properties.
- Trading of contracts.
Or are they not really in use right now?
Gregory Maxwell, Pieter Wuille, and theymos are using a 2-of-3 address to store a bounty for contributions to CoinJoin.
Update: A 2-of-3 escrow and arbitration site recently launched: https://www.bitrated.com/
I don't know of any that implement the advanced features in the protocol. But I do know of two sites that make it easier to do escrow transactions with 2 of 2 secrets:
There was also a bounty on the forums for an easy to use n of m escrow application that emailed all parties involved their secrets: