The "Content Syndication" Admin panel lets you create RSS (and Atom) feeds for your site. Is that what you're looking for?
You also have the option there to add a link to the feed to the site header such that it'll show up as an icon in Firefox and other browser. The "RSS Feeds" block on the geeklog.net homepage, however, is just a "normal" block, created manually.
bye, Dirk