General:

UN database of databases http://data.un.org/

GapMinder moving graphs http://www.gapminder.org/data/

Google Public Data: http://www.google.com/publicdata/

ICT:

ITU ICT statistics 1 http://www.itu.int/ITU-D/ict/statistics/

ITU ICT statistics 2 http://www.itu.int/ITU-D/icteye/Indicators/Indicators.aspx

USC's World Internet Project http://www.worldinternetproject.net/

OECD key ICT indicators http://www.oecd.org/sti/broadband/oecdkeyictindicators.htm