Many people are giving up blogging to try their hand at podcasting -- creating a downloadable audio file that will play on any standard MP3 player. Recording, editing, and packaging a session isn't very difficult but, until recently not very many tools existed to help you get the job done. Now Linux-friendly applications are starting to pop up everywhere.
The basic tools you'll need haven't changed much since podcasting began. At the very least, you'll need a good microphone and headset, and a sound card equipped with a line-in port. There are several high-end hardware products on the market, but for general podcasting needs, some basic equipment paired with good editing software will meet most people's needs.