NationMaster, a massive central data source and a handy way to graphically compare nations.
NationMaster is a vast compilation of data from such sources as the CIA World Factbook, UN, and OECD.
Using the form available,you can generate maps and graphs on all kinds of statistics with ease.
Links to other useful websites : http://www.homeobook.com/links/
Homeopathic research : http://www.homeobook.com/medical-homeopathic-research