We are MetaLair.org. We have created a design for a fully decentralised exchange mechanism able to facilitate secure exchanges between cryptocurrencies and also fiat.
A fully decentralised exchange will allow the spread of cryptocurrency by removing what is arguably the last barrier to entry for the technology.
The design is fully decentralised, when a user signs up, if in possession of just one currency, be it USD, BTC or LTC they can then use this one currency to transact for all the other currencies on the system. This means bitcoin can be adopted by anyone with a desktop, tablet or smart phone without having to go via a central exchange to buy bitcoin: they just download the wallet-client and buy some. Because it is decentralised the exchange cannot be taken down by any single government or territory.