Microphones for Podcasting

I know that with podcasting we now have an excuse to tell the missus that we need to go and buy more hardware. One of the things you will be considering is a decent microphone. Now while I think the headset mic in my Logitech 200 is just fine, there will be those who want a more professional setup. To get your head round the different types of mic are and what you should be using for podcasting, take a look at Scot McPhee's site.