Robin Good: Thanks to Louis Gray who has helped me discover that Google has released a Share Bookmarklet which can be used to capture and post any kind of web content on your Google+ stream.
The Google+ Share Bookmarklet captures instantly title, description and images present on any web page while allowing you to select which image to use (or to drop it altogether) and providing a "comment" box. The title and original description cannot be edited.
The bookmarklet is free to use.
Via Robin Good