The PhoneGap Desktop App
To make our life easier, we now have a desktop app and you are now free to use it, instead of the PhoneGap command-line interface. You can create a new PhoneGap project, import an existing one, and start the local server with a single click. It's still not a mature product and many features are getting added every month.
You can download the application for your Windows desktop or Mac OS at https://github.com/phonegap/phonegap-app-desktop/releases.