I think the delegates forgot that they are not the only ones with interest in the call...
I believe that Talkshoe is the best option. I asked the question, and got some good feedback - including videos! - on
this other thread.
Using talkshoe would allow anyone with internet to listen to streaming audio, AND call in for free using the x-lite "softphone" application (see the video - I set it up and tried it. It is awesome!)
And there is a chat room. as well as all calls are archived right on the talkshoe call page so you won't have to go hunting for them on various websites. And talkshoe will provide much publicity because the call would be listed on their main page which gets tens-of-thousands of hits per day.
And Talkshoe is free, with a capacity of over 300, and possibility for even more.
Another option if they go to freeconferencepro, is to have someone setup a talkshoe account, and bridge the delegate call over to the talkshoe call, then the people could log in to talkshoe to get the streaming audio.