Can some one give me some info/pointers on what kind of stack would such a M2M effort need? I just joined a nascent venture which is trying to do something similar - but a bit more ambitious ... make it device/protocol agnostic. I'm trying to find more resources to read, but haven't been making much progress in terms of selecting robust open source technology. Take a look at http://www.axeda.com/ .. these guys seem to be doing pretty neat stuff!