I have installed the Wp-Post Rating plugin to this blog. Below the title of each article, and above the “Print This Article” link .. there are 5 stars. Feel free to rank the usefulness of each article by dragging your mouse or clicking on the number of stars to rank (1 for really bad, 5 for really good).
The plugin keeps track of all posts having ranks, and the top ranked articles – by the readers – will appear on the TOP POSTS page.
Go ahead and try it!