Plugin to manully type in author? Desperately needed!

Hi all,

I really need a plugin/hack that allows me to add an author/byline to a page/post. I have articles and reviews on my site written by other people who are not users on my site.

I would like the Page/Post title to have this below it:

Written by xxxxxxxxxxxx

Obviously the x’s would be replaced by whatever name I enter.

Can anyone tell me how I can accomplish this asap?

Thanks!