Using WP 18.104.22.168
CSS URL= http://tinyurl.com/9d5rk
Sample page with several comments.
I've tried to figure out which width value to alter to make comments that readers have posted a bit wider as to make better use of the page space, but have thus far failed.
I did figure out how to make the comments form itself wider though.
This is the Dark Maple theme by Mr. Moshu.