Now when you search in Google and you are logged in, you should see a "share" link when you mouse over Google search results. Here is a picture:
This "Share" link only shows up when you hover your mouse over the search result.
Google's Sean Liu then officially announced it on Google+ saying:
Starting today, we’re rolling out a new experiment to show a Share link in Google search in place of the +1 button, making it easier for you to share a great website with your friends. Now when you click the Share link next to a result, you can add a comment about why you found it useful. You can then choose if you want to share it publicly or just to your Circles and it will post to your Google+ stream, making it easier for you to share directly from the search results page. This will appear for those searching in English.
I wonder how long this one will last?
Forum discussion at Google+.