Allows ‘in-page’ widget areas allowing widgets to be defined via shortcut straight into page/post content.
There is one default widget area that can be used or you can add more from the settings menu.
Currently you can have unlimited sidebars.
Each sidebar can be called indepentenly by a shortcode and you can call more than one per post/page.
Sidebars can also be included in a post/page via a shortcode like [ widgets_on_pages id=x ] where x is the number of the sidebar.
With over 50,000 downloads, this is a very useful plugin adding with a very active forum resolution rate.
I would recommend you at least give this plugin a try.