ButterCream WordPress Theme With Right Sidebar
Buttercream is one of the top free WordPress theme in WordPress.org site. You can checkout the original version here http://wordpress.org/extend/themes/buttercream
In my free time I worked on this theme and added a right sidebar to it. Also the width of template is increased to 960px.
I have not uploaded the demo anywhere. However, the below screenshot can help you to see how it works.