Thinking about Skype: Talkback?

I’ve been thinking more about what I can do with Skype and podcasting. I’m wondering if a talkback section would be a good idea. For instance I’d like to do something on the Tomb of Jesus by the Discovery Channel. What I could do is open my Skype Voicemail so that people could record their opinions. Would there be interest in this?

Also would a direct phone number you can dial into the voicemail help? If I get such a number, the first would probably be based in the USA. Would there be a specific geographic location that would be the best place to site it in, or is everything beyond the local neighbourhood ‘long-distance’. I ask as there’s a number XXX-XXX-CLIO based in Washington DC which tempted me, but there’s no point buying it if a phone number on the coast is more expensive for the average caller than one based more centrally.