QuasiDisk, $1.99 AppStore app, has a hidden feature, you can tether 3G internet with it!!. Simply start QuasiDisk FTP server on port 5100, connect it adhoc to mac or PC, and add SOCKS and HTTP proxy settings to the computer on ports 5050 for SOCKS and 6666 for HTTP proxy. Voila! » QuasiDisk Sneaks Into The App Store & Allows Tethering Via Proxy

In the above video you can see a Viper Control plugin with plamonis Siri Proxy to start and stop my Viper SmartStart enabled vehicle. The command is sent from Siri to a Viper server, then relayed via cellular connection to the car. The car then broadcasts an update via RF to the key chain remote. » Start Your Car Using Siri & Proxy