This thread and wiki page may be interesting to you.
So far those are only ideas and aren't implemented yet. There is a patch available on github that implements escrows, but I haven't checked it out so I have no idea how stable it is.
Topic: Using scripts in bitcoin transactions (Read 970 times)
Has anyone started using the script part of the Bitcoin Protocol? Are there any tutorials to this (I mean something more high-level then the wiki entry https://en.bitcoin.it/wiki/Script)? It looks like this could be a great enabling technology for some on-line games and competitions - but it is rather hard to understand what exactly it can do and what are the limits of it.
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