Here are some pictures for your entertainment. If you’d like to use this, you need to install the Google Voice plugin first and then restart you web browser.
Keep in mind that you need the plugin to do this (and obviously a microphone) and that you’ll be calling friends or family using a number provided to you by Google Voice (so they may not recognize it at first).
The best thing going for Google’s new calling feature (if you ask me) is that its completely free for me to call any phone in the USA. While this pricing may not be permanent, it should at least last through the course of this year (my source for that is linked somewhere up above ).