Technical Inquiry

I know Russell Standish has responded to a comments on an article he co-wrote with Steve Keen. And I have had some comments on even older posts. But how would you, dear reader, know this?

I believe changes to my blog are being published to a RSS feed. But how can I easily create some sort of default button to put on the right to let readers push to obtain the RSS feed?

And I have seen some blogs list recent comments on the right. How can I do this? Is there some HTML that I can include in my template?

Thanks in advance.