Or is IRC is the free software for live chating? I suggest It because it is using by Wikimedia project, and you are not required to reg. you nick name.
 
In Chinese Wikipedia, there is an discussion that on the 15th January will have a regular chat on zhwiki Skype.
 
Editor of Chinese Wikipedia - HW


>On the 15th of January, I would like to make myself available for a
>short video conference with as many local celebrations as want me to
>join in some way.  Big or small.  If it's 3 people in a coffee shop in
>Tajikistan, I'd love to say hi.  If it's 100 people at a party or
>conference, I'd love to say hi.
>
>From a logistics point of view, the easiest thing for everyone is
>probably Skype, but if anyone wants to suggest a free software
>alternative, I'm happy with that as well.
>
>I will be in London with decent but not super awesome connection speed.
> Time zone doesn't really matter, I can get up in the middle of the
>night and go back to bed afterwards. :)
>
>In terms of process, I would propose that we start a page on the ten
>wiki where local organizers can post requests, and then Topher and I
>will study it and contact people for more details.
>
>--Jimbo
>
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