- Use the time to think. Driving the same commute every day becomes automatic and you can solve problems, practice a talk, iterate or come up with ideas and so on. Take notes via voice.
- Podcasts. There's an endless amount of learning available. Some recommendations: 99% Invisible, Making Sense, Hardcore History, Freakonomics, Business Wars, Planet Money.
- Audiobooks.
Make it a habit and you can actually get to the point where your commute is almost painless and even something to look forward to (particularly if it's the only place you listen to podcasts/audiobooks). Sometimes I actually end up waiting in the car extra time for a Podcast to finish or to clean up notes.