After searching for quite a while for a nice looking stock quote module for DNN3 and not finding anything, I set out on a mission to develop one myself.  The Stock Quote module you see above and in the right side pane is the result.  The module retrieves quotes from webservicex.net at the following address: http://www.webservicex.net/stockquote.asmx.

Settings:  below is a screenshot of the settings for the module. (Click to view larger image)