In what can’t be considered an unexpected move, Yahoo! has added PC-to-Phone and Phone-to-PC features to Yahoo! Messenger, which squarely competes with SkypeIn/SkypeOut. Yahoo! launched a public beta of Yahoo! Messenger with Voice today, which enables enhanced PC-based calling capabilities and VoIP connections to and from the PSTN. Rates are low, with most calls costing a penny per minute, undercutting Skype’s current rates for their similar service.

So who’s next, Google or Microsoft?