Despite Google+ only being announced last week there’s already some great Chrome extensions to make sharing and keeping in touch with Google+ a little easier.
+1 Button [from gaikomino]

While not having total affinity with Google+ the +1 button Extension does bring something to the table, that I’ve been after, by including a +1 icon next to the Chrome’s star in the address bar which allow you to +1 the page you’re on.
This little addition in conjunction with the +1′s tab our profile pages we can start to see how +1 could be a great way to store bookmarks. There might be a need for similar privacy controls already added to Google+ posts. And we all know that Google’s mission is to organise the worlds, and now our personal, data it’s not a big leap to add some form of structure control to the +1′s.
Note: At this point the items I’ve +1 via the tool haven’t appeared in my profile yet.
Surplus [from antimatter15.com]
The Surplus Chrome extension is a really easy little tool that allows you to instantly access you notifications. Technically it doesn’t appear to be doing anything spectacular, just except rendering the notification content that appears when you click on the notification button in Google+, but it’s useful nevertheless.
Will Google Build in stuff to Chrome
I can quite easily see Google including these type of features into Chrome in future builds, assuming there’s law suits from Facebook, a-la Microsoft’s problems with the European Union.
QR Codes
Here are the QR codes for the Extensions :-
+1 Button
Surplus QR