You will find a couple of solutions. Becuase you are recording a podcast, you will simply need stereo system/mono functionality.
Lots of people inside your boat make use of a free program known as Audacity. It's free and work perfectly.
If you want to spend a couple of more dollars, Steinberg make a sound editing suite known as Follow up. It is a fantastic and concise audio editing and recording application.
You could also want to look at Sony's Seem Forge Studio. It a stereo system recorder/editor. I have tried on the extender for several years and love this program.
Additionally, you may require a mic and preamp that connect with your computer via USB. Whether it's just you and also not one other mic's are essential then you might like to go the USB mic route, forgoing the preamp. If you choose to decide on a preamp, try ones from M-Audio - they are affordable and work great. Actually, M-Audio constitutes a podcasting package with incorporated software I believe. Take a look at Guitar Center for more information.
If this come time for you to upload your podcast, you will want to do your homework on Feed visitors, take a look at feedburner, in addition to possibly obtaining a site of your likely to host them there. Wordpress offers some good add-ons for podcasters searching at creating sites with audio.