I'm a avid podcast listener. Whether in my car, walking to work or in the shower (bluetooth shower radio ftw) I've got a podcast playing in Instacast.
My podcasting habit started in 2005. That was the year that two of my favorite podcasts debut: This Week in Tech and Diggnation. Although Diggnation has since been retired I still enjoy TWiT to this day.
Below are the current podcasts that are in my core rotation (that's an official podcast listener term :). There are many others that I sporadically listen to based on the guest or topic of the episode. There are also others that I loved but didn't include as they have been retired (such as Diggnation, Hypercritical and Build and Analyze to name a few).