Chat For Google (Chrome Extension)

Google's just released 'Chat For Google' official extension that lets you keep in touch with your contacts in your 'Google+ Circles' & Gmail contacts even when you are not in Gmail or Google+ window. The extension offers you a stand-alone chat client that works with Google's service. The extension also works with Google+ Hangouts.

If you are a Google Chrome fanatic; this extension is a 'must have' :https://chrome.google.com/webstore/detail/nckgahadagoaajjgafhacjanaoiihapd/details