Markets in Everything: Datasets (Many Are Free)
The website "Infochimps" makes it easy to buy, sell and share data online. Many datasets are free, and some are available for sale, here are some examples:
3. NYSE daily data (open, high, low, close, volume) from 1970 to February 2010 (free), free datasets also available for NASDAQ and AMEX.
4. Word list: +100,000 Official Crossword words (Excel file, free).
5. MySpace user count by zipcode ($120).
HT: Peter Parlapiano