Now you can use Gmail to make phone calls!

Tweet Google Voice's new "Call Phone" feature in Gmail has been met with much enthusiasm, with users making one million phone calls within the first 24 hours of it's launch!
The "Call Phone" feature enables Google Voice users to call a phone number via their Gmail account, a step up from Google's Voice's existing computer-to-computer voice and video chat service. Google takes the service one step further and allows you to receive calls via Gmail once you have made an initial outgoing call using the service. For Google's tutorial on making and receiving calls with Google Voice, click here.

Calls to the U.S. and Canada using this service are currently free in 2010 but this may change. Google charges users for international calls. A Google Voice account (free in US) must be linked a Gmail account sharing the same username in order to receive phone calls.