I am looking for several sources of historical minute-by-minute ticker
prices for stocks on the New York Stock Exchange.

Ideally, the sites would be 
1) free or inexpensive 
2) allow me to pick and choose which stock histories to view 
3) provide an easy way of downloading the historical data into a local file.

If minute-by-minute data is not available, any sources with intervals
of less than 1 hour would be acceptable. However, the usual opening &
closing price information for past trading days is not adequate. The
sources must also have continuous data for at least the past year.
Thank you.

---

Clarification of Question by americanwalrus-ga on 21 Jun 2005 15:16 PDT

Edit: the quotes would need to be in half-hour intervals, or shorter.