Google's calling system

Google is set to add a calling system to its Gmail and search offerings. Google has announced that it will install Google calls capable phone booths in universities and airports. This is great news, especially for those who are looking at thess free communication needs. How successful is this free calling system? The Google calls system has logged 1 million calls within the first 24 hours. It seems like Google is taking a share of the pie that Skype has once owned.