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RSS feeds became essential for blogs and any other website that publishes content on a regulary basis. It's a good way to broadcast your content and allow your visitors to follow your blog by suscribing to your feeds.

A Google Sitemap is a very important element for ranking of your website : it is used to tell Google which pages it must include in his engine. It also helps your new pages to be ranked quicker, and to be sure that all your relevant content is indexed.

A Sitemap, it's basically a map of your website (I hope you already guessed it); a tree of pages in which the level of importance of certain pages over some other pages is cleary visible.