There are several ready ways to add a live, updating stock information to your site:
- Wikinvest.com allows you to customize the chart and then provides ready access to the embed code, similar to a YouTube Embed. See blog.wikinvest.com/2008/08/01/finally-embed-a-real-stock-chart-on-your-blog-or-website
- If you want more information than just a chart, finance.yahoo.com/badges is a real winner.
- If you have a WordPress site, a Facebook site or a generic website then www.sanebull.com is also a winner