Getting sources of Data is always a problem when tackling a statistical or data mining project.  Here are two very nice deep web assets:

http://databank.worldbank.org/data/home.aspx  – Speciality statistical data on all kinds of subjects, from countries GDP to levels of blindness.

http://www.quandl.com/ – An awesome collection of 9,000,000 of financial, economic, and social datasets.