Gmail and Google Voice Integration: Missing Ingredients

On Wednesday Google launched a new Gmail feature that lets you place phone calls via Google Voice right from your Gmail inbox. Overall, the new service is a great addition to Gmail, and may even convince some users to give up their Skype accounts in favor of Google Voice. But while Google is off to a great start with voice calling in Gmail, there are a few changes I'd like to see that would really put this service over the top.