I am on a conference call that used this service to set up the call. The call was to area code 712. Other than that, it worked just like a regular conference call. They have other related-services for a fee, like webex for $0.25/minute, etc.

http://www.freeconferencecall.com/

Hey, maybe we could do a grocery couponing conference call, some time.

That would be great during nights and weekends.... I am thinking of the cellular calling plans.

thanks!