I have my doubts about Google's drive to add Google+ features to each and every one of its apps and services, but here is a new Google+-related feature that actually makes perfect sense: starting today, Google Voice – the company's VoIP telephony service – will integrate with your Google+ circles.
Here is how Google describes this feature: "Circles give you more control over how you manage your callers; for example, calls from your “Creepers” circle can be sent straight to Voicemail, only your “College Buddies” circle will hear you rap your voicemail greeting, or you can set your “Family” circle to only ring your mobile phone."
Depending on how you use Google+, this is indeed a really useful new feature, especially given that Google makes it very easy to set rules and even different voicemail greetings for every different caller.
Sadly, No Circles Interface in Google Voice
It's worth noting that this doesn't mean you can now drag and drop your contacts into different circles, though. Instead, this feature is actually a bit hidden in the Google Voice contacts settings (click on Contacts, then select a group, then click on Edit Google Voice Settings.
Chances are, if you follow a lot of people on Google+, just a few of these are likely to ever call you. This feature, then, is probably more interesting for those who are either very meticulous about how they organize their Google+ circles and those who use it as a very personal social network and less like Twitter or Facebook.