I'm a big fan.
Supposedly he wrote all of the songs on White Blood Cells (one of my favorite White Stripes albums) in a week and recorded them all in 4 days.
I'm a guitar player too. His songs are as simple as it gets. He just executes very well. My guess is he's just like "I'm going to write a song now, using only G C D for chords."
Great message in the video. Want to write a book, record an album, do stand up comedy, design a website, etc? Why haven't you? Do it this week.
/back to work