Ok,

this sounds nice There's a thing though, I can imagine it's quite hard to explain the answer when people ask technical questions on the phone, we just have to find out I guess. Maybe skype is an option as well for better sound quality?

What do you have in mind for the actual content?

the way I do stuff is to interview someone on a specific subject., with the call in lines open.
Or, for instance you talk about the problem getting backgrounds to display in IE7 - have callers call in and when they are online they could give their website address problem page - either verbally or in the accompanying chat window that comes with the blog talk radio show... we could all navigate there and the page could be discussed
- the latest ways to use css/ or php or mysql.. you could make examples... and discuss them..
I can go on....

It feels like this will not work with solely audio. There's really a need for visual explanation especially with less trained people that are fairly new to webcoding.

It might work better if I host my own live training where people can ask questions and I can show them on the fly how things work. This might be an idea for the near future. I'll have to let it sink and so how it evolves in my mind