Use WP to manage your stocks watchlist. Publish your watchlist on your blog with live prices from Yahoo Finance.
Manage your stocks watchlist with your WP database. Your watchlist is managed in a new DB table and configured in it's own page in the Manage menu of the Admin area.
Publish your watchlist anywhere on your blog with 'live' prices from the Yahoo Finance website.
Your web server needs to be configured for cURL to work if you want the prices to be retrieved from Yahoo Finance.