tcepsa | Stock Market Feeds?

Anyone know of any good (preferably live) stock market value feeds, or sources of raw stock data? Even old data would be very useful at this point; basically I'm looking for a large collection of data for multiple stocks, preferably with multiple data points per day. (the points of data I'm looking for are stock ticker code, full timestamp, and price of the stock at that point in time... though I could at this point probably make do with the stock ticker code, the date, and the starting, ending, max, and min prices throughout that day)

(not really particular about which ones at this point--would be awesome if I could get some major ones as well as some penny stocks, but at this point it's not particularly necessary...)

Thanks!