As myself an evangelizer of what I say "telecommunication 2.0", I am happy to see the proof of GrandCentral not being killed off by Google. Yes, Google launched their Voice service as a "preview" based on GrandCentral and it's existing users.
Although Teleflip, an email-over-SMS service, is a goner, Google has integrated SMS in to their Voice service. Well, it's no replacement of Teleflip since the concept is pretty much the opposite, but with push email becoming more common, this type of service is probably unnecessary. However, the other way around would be useful; you can receive text messages on Google Voice number even though it is not a mobile phone number. Now, only if this feature would forward messages to your email account, I can really get rid of my text-messaging plans.
As I pointed out in my earlier post, you can use Google Voice and Gizmo5 to make free calls within the U.S. Now you can also make cheap international calls; maybe cheaper than Skype.
BTW, what do I mean by "Google Talk + Voice = Unlimited Free Calls"? Well, this is the case with Google Voice and Gizmo5 as of now. But will Gizmo5 be happy about this model? I doubt it as this brings traffic to Gizmo5 without any immediate revenue. If this becomes an issue, Google can always turn to itself, Google Talk which is it's own VoIP service. Then, totally within Google's own hands, it can provide a free VoIP (Internet-to-landline) service.