Kirk:
Take a tour, click everything. You'll find a *LOT* of features here that are very stock-specific, just like the ability to insert graphs in your posts, as you've obviously found.
One of the things that you specifically might be interested in, is that we have an e-mail list built into each thread. Click the 'Manage' link below the header to see some options like that.
Feel free to ask any questions about the site features, rules, etc.
MB