Nirvana: I dont think WebTV users can use Skype

http://www.skype.com/help/guides/

What equipment do I need to use Skype?

<span>The short story: you’ll need just a computer and to have downloaded Skype and an internet connection (broadband preferred).

All modern home computers can run Skype and you can use the built-in microphone and speakers to make calls. You’ll get much better audio quality if you buy a headset. You can purchase one at the Skype shop or at your local computer store.

The technical bit: You need a PC running Windows, a sound card, microphone (built-in or external) and speakers or headset.