One of the best deals on the Internet -- free Skype to Skype calling -- may be coming to an end albeit slowly and quietly. Skype has launched a new, improved version of its VoIP calling software for Apple's iPhone and the service between Skype users on AT&T's network is slated to carry a charge beginning next year. 
Wi-Fi calls will remain free between Skype callers, but a new as-yet-undisclosed charge will be leveled at Skype iPhone users beginning in 2011.
Skype said its new iPhone 2.0 service will offer "CD-quality sound" for Skype to Skype calls on their iPhone 3GS or second and third generation iPod touches. The new offering also includes a call quality indicator that suggests the best time to call.
Source : http://www.informationweek.com