I highly recommend people who use cars to somehow do this in their cellphones and connect the cellphone to the car soundsystem.
I cannot stress how much Traffic is not traffic anymore as soon as it become introduction to evolutionary anthropology.
Bostrom told me there is cellphone software for accelerating podcasts, but it only worked for paid ones. Does anyone know one that is free?
Actually, I would suggest not focusing your attention on evolutionary anthropology while you're supposed to be piloting a multi-ton vehicle at high speeds.
Most people are far worse at driving than they believe themselves to be.
Now, assuming you're not in a car at the moment, you can probably hack something up using mplayer - there's at least one android port of that. You may need to write your own UI, though, and I suspect it'll reduce your battery life significantly. (Android native players take advantage of decoding hardware, mplayer probably doesn't. Also, the fourier transform required to speed up voice without affecting pitch is expensive.)
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.