What he wants at the bottom of his posts:
Questions, comments, have a campaign success or failure story? E-mail me, and I may include it in an upcoming column.
I replied with the following (let me know if you have any other suggestions to add to this):
I also have AddThis on my page.
Here is the blogger post regarding rss atoms.
Step by step if you have feedburner:
Step 1: Log in to your feedburner account
Step 2: Go to the publicize tab on top after you are signed in
Step 3: In the publicize page there will be a menu on the left, click on chicklet chooser from that menu
Step 4: You will see all kinds of feed subscription buttons and their codes...just copy and paste the required code in your blog template
OR Add this code to your template:
<a class="img" href="http://www.bloglines.com/sub/http://feeds.feedburner.com/blogspot/AI" ><img src="http://www.bloglines.com/images/sub_modern5.gif" alt="Subscribe with Bloglines"></a>