Google makes it official: Phone calls now in Gmail | Relevant Results - CNET News

You can now make phone calls in Google Mail, gmail. Very cool.  Of interest to google voice users from the official blog post: "If you have a Google Voice phone number, calls made from Gmail will display this number as the outbound caller ID. And if you decide to, you can receive calls made to this number right inside Gmail (see instructions)." -- http://gmailblog.blogspot.com/2010/08/call-phones-from-gmail.html