If you need a USB mic for recording podcasts, streaming online, or tracking vocal parts, the Mackie EM-91CU offers a quality sound for just this purpose. It also delivers a reliable and rugged design at a reasonable price, making it both a suitable entry-level product and a solid choice to augment a podcaster's existing collection.
With its cardioid polar pattern, the mic rejects sound coming from behind the capsule to tamp down on pesky room ambience; this is a plus for many people who podcast from their home. All the accoutrements you need to get started are included. Mount the mic in the supplied shockmount, plug the included USB cable to your computer, and you're good to go.