gmail telephony

It is nice to be able to call a telephone from your browser, without any special application or having to register with a SIP service. This is what GMail/Google Chat now allows you to do. "Nice" adequately describes this feature.

The transformation from "nice" to "wow" would happen if I could call someone on their phones using their email address without knowing or caring about their phone numbers, if I could turn off receiving calls when I wasn't online, if I could conference in other people while on a call with someone by just dragging and dropping contacts in my browser....