Nice - wonder if there is some integration we can do. This is also open source and a trading platform to provide automated systems, graphing, etc.
There is Buttercoin, and that appears to be a fairly extensive HFT platform, but it's not decentralized.
Confidence Chains give you a lot of things that are very appealing to the bitcoin world. It's very simple, easy to modify and customize, and anyone can get together with their friends and run an exchange, issue assets, bonds, and much more(explained in upcoming papers). You can just search on 'Confidence Chains' here and you can see the other stuff I posted. It's very close to Color Coins and I contribute to those discussions on here and elsewhere.
The underlying problems of coordinating trades over a WAN is not simple by any means and should not be underestimated.
I will announce on here what the timeframes look like. Eventually anyone will be able to run their own decentralized exchange.