I am in the process of moving my HomeSeer system to ST. My last few items are items that only have access via serial ports or iTach serial->wifi bridges.
I have written an application in NodeJS that works as a web service bridge between these types of devices and specifically created modules for the Rain8Net irrigation control system and Neptune Systems Aquacontroller (aquarium controller). The NodeJS application can be easily expanded to add additional modules for say DSC alarm integration (though I know someone already did this), or other types of devices like this.
I would say this project is about 1/3 complete at this time. My next step is writing the ST DeviceTypes and SmartApp. The SmartApp will work as the bridge between the web services and the DeviceType.
I am looking for anyone that has either of these two devices and is looking to integrate and test or assist in development of the ST related applications.