If you use Chrome, these will both come in handy.
Embedded Link
Get Google+ features in the Chrome browser
Google Chrome is a browser that combines a minimal design with sophisticated technology to make the web faster, safer, and easier.
Google+: View post on Google+
I have enough Google applications open that the Notifications isn't that useful, but having a generic +1 button will be nice.
Chrome is a joke. Firefox whips it in every category, especially compatibility and support.