I've been listening to more podcasts lately (e.g. .NET Rocks, Hanselminutes, etc.), and they certainly contain good information. When listening to podcasts on my PC via Windows Media Player, I tend to set the playback rate to a higher rate in order to compress time.

When playing back audio files on an iPod, you can do the same type of thing, but you have to know the secret. You need to have a 4th generation iPod, have your audiobook/podcast encoded as an AAC file, and change the Settings > Audiobooks setting in the iPod to Faster. After doing that, I am now traveling through time around 25% faster.