I came across a hack on Singpolyma's blog which enables you to feature "Wordpress" style comments beneath your blog posts, so readers can leave their comments without having to leave the page!
You can choose to install regular inline comments, or have them perform a "peek-a-boo" function where the comments only appear when your readers click on the appropriate link. Full instructions can be found here on Singpolyma's blog. The hack is quite complex, so be sure to follow his instructions to the letter in order to make this work properly in your blog.
If you would prefer to simply install a template which features a similar hack, try the K1 template from Blogger Templates, which is a (new) Blogger layouts style template featuring commenting below the posts.