Should I include phonegap.js or cordova-3.0.0.js or both in a Phonegap 3.0 app?

Should I include phonegap.js or cordova-3.0.0.js or both in a Phonegap 3.0
app?

I have just started looking at Phonegap 3.0. If I create a new app
skeleton using the command-line interface, I get an index.html file with
phonegap.js included. On the other hand, all the examples in the API
reference in the documentation have cordova-3.0.0.js included instead.
Which one is the right one? Are they interchangeable? Do I need both?