Google+ Tips, Tricks and Secrets
How to Comment on Google+ Posts in Gmail
You don't have to open Google+ if you've receive a notification (of a new post, photo or comment perhaps); right in your Gmail inbox, you can comment and +1.
How to Control Google+ Email Notifications
Don't want to receive email notifications for just about everything in Google+? Want to be kept up to date by email about what's going on at Google+? Here's how to selectively enable email notifications in Google+.
How to Share an Image Attachment on Google+ in Gmail
You don't have to download attached images from Gmail and upload them again in Google+ to share them in a post. Gmail lets you post them directly to your circles, specific recipients — or the world.