My SmartThings multisensor is a great little piece of technology. It reports, in real time, motion, temperature, and open/close state of my back door. The iOS app is slick, too, but I wanted a way to view it from my computer and have access to historical data.
Enter Dweet and Freeboard from Buglabs.
There's actually no setup required on Dweet (but be sure to check out their nifty demo). It just starts eating data and making it available for use via HTTP/JSON!