I have been collecting 1 minute intraday historical data of NYSE, NASDAQ, and AMEX stocks (7100 tickers) since 3/16/2007. They are MDF files, which can be read with free SQL EXPRESS easily, for each day. Customized format can be generated on demand and I can provide source code (C#) to retrieve the data. Please see attachment: records are stored, for each minute, as open, high, low, close and volume. Total files size is about 45G. PM me if interested. I promise you a good affordable deal. Thanks.