Is it currently possible to send to Google Plus from Google Reader?
Either a Chrome extension or a custom Send To link would work.
Update: This question is now obsolete. With the changes to Reader, Google+ sharing is now integrated.
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As far as I know it is not possible to share articles in Google Reader to Google Plus.
The only alternative I can suggest is this Chrome Extension which adds the Google+1 button to your toolbar. This enables you to +1 the current site that you are visiting. Although it doesn't directly enable you to share Google Reader posts - you can open the link directly in your browser and then click the +1 button.
You should remember that this adds the current site to your +1 tab it does NOT post this to your stream.
I found the perfect Chrome Extension - adds "Share on Google Plus" in Reader. Here's the link.
Works a charm for me.
While we're waiting for a native way to do this, someone found the URLs to use to make a customized "Send to" solution.
After this, when you're reading any article in Google Reader you'll see Google+ in the 'Send to' drop-down menu at the bottom. (You will probably have to refresh the browser page after you do this.)
With the recent changes to Google Reader, this is now possible. You can either click the +1 button at the bottom of an item and optionally add a comment, or you can click in the Share... field at the top right corner of the window. The Share... field lets you share without adding the item to your +1 list.