This is for the mac side of webcasting interns:
While in Skype Beta 18.104.22.168:
If you are in a conference with some folks and want to bring in a skypecast:
Go to the skypecast you have created as the HOST. Join then press HOLD in skype, go back to the skype group you had already established, look towards the bottom of the group and find a drop down menu, select add to conference, choose the skypecast and then you will have both the skypecast as well as the skype.
Now, true to SKYPE, this will not always work as listed. If so, quit SKYPE and go in again. The moral of this story, set up your webcast at least 15 to 30 min. ahead of time. make your skypecast go much longer than you intend.