As far as Blogger has come, I haven't found an easy way to list recent comments by commenter's name and post title as seen on Typepad and Wordpress. What I'd like is "Graham Powell (commenter's name, linked to comment) on Holiday Weekend?" (post title, linked to post).
Any sort of comment list can clutter a sidebar, so instead I've added Popular Posts to the Topics index. This will tell you which posts have the most recent comments.