Actually, there has been a previous discussion on Cutline and multiple author blogs. Inthis thread (http://wordpress.com/blog/2006/09/23/cutline/), on 9/26/06, gtfbfan wrote that:
"Finally, regarding the “major flaw” of author names not showing up underneath the post titles… The author names have been coded into the theme, but they have been commented out because most sites are single-author blogs (which would therefore make listing the author name unnecessarily redundant). Perhaps someone could request that the WP.com team uncomment these author references."
I don't really understand what "commenting out" is, but I read this to mean that Cutline is fully capable of displaying author names, it's just that the version offered on wordpress.com isn't. I really hope someone will take the time to offer another version of Cutline for multiple authors, since the designer left the capability there. Cutline is by far the best template for my needs, and since I had to change to it midstream, adding bylines or categories to hundreds of old posts is not an option.