The first "intelligent" exchange I (Spencer Lievens) have seen -
http://www.metalair.org/About MetaLair
MetaLair are one of the very first UK Bitcoin, Litecoin and cryptocurrency startups.
We are looking for investment and donations to develop our double spending proof fully decentralised exchange mechanism able to facilitate secure exchanges between cryptocurrency blockchains and also fiat.
When Satoshi created Bitcoin he solved the Byzantine fault tolerance Problem, also known as the Byzantine Generals Problem; first formalised in 1975, it posits the near impossibility of achieving consensus on a decentralised network.
MetaLair is continuing where Satoshi left off using the mechanisms he developed to create a decentralised cryptocurrency exchange.
We would like to hear peoples thoughts on this exchange.