[whpalmer4]

If you read carefully, you'll see that it is being done over your WiFi network, not when you plug in your iPhone. The Splash folks apparently built in their own server in the desktop application, or maybe at Splash galactic HQ. The Omni approach is more generally useful, in that you can use it to sync desktop machines that aren't networked together, for example, but it does require that you have access to a WebDAV server in the iPhone case.