I'll tell you how to make the Recent comment of course on the part automatically feeds on Blogspot.
For those who do not know ... check here:

1.Go to Design
2.Click Page Element
3.Click Add Gadget
4.Search a Feed Widget
5.And copy of this link in the feed URL [ http://yourblog.blogspot.com/feeds/comments/full ]
6.If you finish, click Continue
7.And set at will what you want to show in your blog.