Remind HN: RSS alternate link on your blog
It's very easy. Just add to your blog template a link like:
<link rel="alternate" type="application/rss+xml" title="YourBlog - RSS" href="http://example.com/feeds/posts/default?alt=rss" />
This helps people subscribe to your feed and share that post.
I think this might also allow someone to type in your base URL into Google Reader, and it will pick it up.