Google have added some neat new features for Google+ recently. Them being, notifications right by the address bar, +1 button for any page and a new YouTube bar within Google+.
Google+ Notifications Extension
The first extension is the notification button. Once installed you have a button right by the address bar from which your Google+ notifications can be viewed from any web page. When you have a notification, you can click on the button and you will be presented with a drop down menu, showing you your most recent notifications. An even quicker way to stay up to date with Google+
Google +1 Button Extension
The second extension is the +1 button for any page. When you find a page you like anywhere on the web and it does not have a +1 button, this button will enable you to +1 anything. You can even share it to your circles right from there without having to open up Google+.
The last new feature is the new YouTube bar right on your Google+ homepage. As you can see on the right, when you hover over the YouTube button a search bar pops up. You can search for anything you like, I searched one of my favourite artists, The Weeknd. Once you hit enter a new window will pop up showing a playlist for that artist. You can then search for more music, have it continue with the playlist or share the playlist with your circles.