Google's Circles feature is a great way to keep your various online social factions safely segregated. And, starting today, you can partition your Google Voice contact list the same way.
Google announced today that Voice users will be able to sort and organize their callers using the Circles and Groups from their Google+ accounts. You can control call screening, ringtones and voicemail messages individually for each group. The new options are available in the Groups & Circles tab in the Google Voice settings menu. [Google Voice Blog]