I was ambivalent about the utility of Grand Central when I signed up for my free account last year; I’ve got one phone that I use, and the voicemail in your inbox feature was kinda whatevs.
But then Google announced the relaunch of Grand Central as Google Voice; this was the feature made me super-excited:
Billing and International Calls: Making international calls
To make international calls at very low rates, just dial your Google number, press 2 and call anywhere in the world. You can also make calls directly from the Google Voice website.
Since their prices are Skype-competitive, it means I can finally untether myself from my computer without buying a ridiculous Skype phone and my call quality no longer depends on whatever shitty Internet service I happen to be on (e.g., Time Warner Cable, free city wi-fi).
Now all I need to do is spend the last $2 I have on my Skype account.