Google+ is now one year old, but it's still seeping into the rest of Google, filling nooks and crannies it hasn't yet filled. The latest addition is the Chrome Web Store which is now the proud owner of a Google+/+1 button for "liking" and sharing to Google+ Circles.
Another interesting addition is the new "From your circles" category which, as you may have guessed, is filled with apps that the people in your circle have +1'ed or shared with their friends. It's an interesting way of discovering apps and extensions that may be useful to you and, more importantly, that you can trust.
Finally, apps that have been +1'ed by someone from your circle will be marked as such when you stumble upon them in the Web Store, either via search or just by browsing, enabling you to know which apps get your friends' recommendations.