I started with Breakfast At Tiffany's by Deep Blue Something. The whole song is only G, A, and D chords. Click here for the chords.
Another easy one is Smells Like Teen Spirit by Nirvana (or at least the intro).
Those are the only two songs I can really play on the guitar... I've been wanting to learn others.
Today I'm gonna try a little harder
Gonna make every minute last longer
Gonna learn to forgive and forget
'Cause we don't have long
Gonna make the most of it
Today I'm gonna love my enemies
Reach out to somebody who needs me
Make a change, make the world a better place
'Cause tomorrow could be one day too late
--lyrics from "One Day Too Late" by Skillet
from their new album "Awake"