The site for the UN's Human Development Report has maps that show the (somewhat) shifting geography of development over the past few decades. Here are maps of HDI - broken into the conceptually nebulous but statistically precise categories of "low," "medium" and "high" development - for three selected years:
The main action seems to have been in Latin America, where several countries have gone from medium (.500-.800 on the HDI scale) to high (.800+), and in South Asia, where the entire Subcontinent has jumped the bar from low (<.500) to medium development.
But of course you notice how broad these categories are: high devlopment countries as of 2006 include everything from Ecuador to Denmark; middle income countries include both Thailand and Papua New Guinea. But you can click on countries to get a ton of details on demographics, health, education, and economics. You can also see HDI numbers for every hald-decade since 1975; China, for instance, has gone from .530 in 1975 to .777 in 2005.