Check out...

http://articles.moneycentral.msn.com/Common/FreeCharting.aspx

With Money Central you must agree that the information is only for personal,
non-professional use and that you will not give third party access to the
information.  So it may be of limited use to you if you plan on distributing
your app or service.

And there is...

http://quotes.freerealtime.com/dl/frt/S

I haven't read their agreements - but it is sure to be similar to Money
Central's.

No matter which you choose, you'll need to do a little parsing as they
weren't really meant to be a data stream for outside applications.

If you don't really need real-time stuff you can try Yahoo Finance.  In
fact, there is a free application called Yahoo Historical Quotes Downloader
that takes a text list of stock symbols and downloads the data into Excel
spreadhseets for you.  My suspicion is that they are just parsing the data
from Yahoo Finance (for example for Citicorp the URL would be
http://finance.yahoo.com/q?s=c&x=52&y=15)).

Have fun!

jim

Pete,

   Without paying?  Not real time, but you can probably get 20-minute
delayed prices...  For real time, you are going to have to pay a hefty
price.

   Doing a simple google search will show these (search for "real time
market prices").

I cant see any link that tells me how I can query the site(s) in code - am I missing something ?

thanks

There probably is not a free one or not a legal one, you could scrape a
screen, but the sources of exchange data have strict rules on the usage of
the data...