The consequences for human welfare involved in questions like these are simply staggering: once one starts to think about them, it is hard to think about anything else.
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AuthorsEconomics Resources
ENG / http://www.econlib.org/ 
A very good website containing a lot of whole books (of Ricardo, Milton etc.) and interesting recent speech.
ENG / http://ocw.mit.edu/OcwWeb/Economics/index.htm
A collection of resources from MIT's economics courses.
ENG / http://econpapers.repec.org
EconPapers provides access to the largest collection of online Economics working papers and journal articles.
ENG / http://cepa.newschool.edu/het/thought.htm
A nearly-exaustive history of economic though repository: very clear and useful.
ITA / http://www.mynashequilibrium.com
Un «blog about economics, academic life, graduate school and "how to become an economist"».
Useful links
ITA / http://www.ilsole24ore.com
La versione online del quotidiano economico-finanziario pił venduto d'Europa.
ITA / http://www.lavoce.info
Un interessante giornale online sulle vicende di attualitą economica scritto e diretto da economisti.
ENG / http://www.economist.com/research/Economics/
A database of economics hot topics.