That symbol above means that the Bean Stalk has an RSS feed to keep you informed of all its latest updates. But what's an RSS feed?
RSS stands for Really Simple Syndication. If you use an RSS reader, you can receive updates instantly to your feed box without having to wait for someone to post to tell you that something's changed.
If you already use an RSS reader, great! If not, I heartily recommend either Netvibes or Google Reader. Netvibes is good for every day things anyway, so I would go there first.
Then, enter the Bean Stalk's address into your reader to locate the feed. Usually entering http://www.beanbunny.com is enough, but you may need to enter http://www.beanbunny.com/rss.xml.
Then, sit back, relax, and enjoy the updates that the reader brings to you automatically!
Still lost? http://www.whatisrss.com/ is a useful site to help you along. Happy feeding!