If you aren't using FeedBurner you can get it from http://feeds.feedburner.com. It's easy to generate a feed for your blog just by entering your blog url and giving your feed a name. If your totally lost about what a RSS feed is, in simple terms it's another way for your readers to know that you have added new content without them visiting your blog. They can get notified in a several ways but the most popular is through a feed reader (like Google Reader) or via email.
There are several features you can add to customize your feed with FeedBurner and FeedFlare is great because it gives you the option to add "Flare" to your feed and to your blog. This feature was updated recently to include Google Buzz as an option.