We still don't have effective Caller ID for VoIP. So who's going to take these calls from your computer besides people who *know* you are calling or your dentists office? You can't use it for anything but calling grandma. Don't get me wrong, VoIP on your system is a wonderful thing, but Skype was just worthless when I'd have to make a business call and my client would say to me "Oh, I didn't know +000001234 was you." I expect the same from Google, Yahoo, or any other player looking to break into the market. Until they have CallerID implemented correctly (and *not* hackable!) it's not ready for prime-time.