The CIA World Factbook has long been a trusty resource for information about the nations of the world. This past Monday they introduced a new website design, which makes navigation easier and adds some new functionality. One of the most useful new functions is the ability to rank countries by basic measures. This function can be found under References - Guide to Country Comparisons. A few examples include countries ranked by Internet users, life expectancy at birth, and length of railway network.
Their map navigation has been improved, and their regional maps are wonderful. Please take a look at this very useful resource.