Alex Mansfield

This plugin allows you to display an unordered list of links to a specific author’s latest posts (or a list of multiple authors). It can be called either with a shortcode or from within a theme file.
To call it with a shortcode, use <code>[latestbyauthor author="username" show="3"]</code> where “username” is the login name of the author (or a comma separated list of multiple authors) and “3” is the number of posts to display. If you don’t specify an author or a display number, it will show the latest 5 posts from the author of the current page. If you want it to display the post excerpt as well, you can use the following code: <code>[latestbyauthor author="username" show="3" excerpt="true"]</code> This will only show exerpts that you have entered manually.
To call it from within a theme template, you have to wrap it in this PHP function: <code><?php echo do_shortcode('[latestbyauthor author="username" show="3"]'); ?></code>

Latest Posts by Author

Displays an unordered list of an author's latest posts.

powtac

mzeecedric

kikuyumoja

This plugin prevents the 404 error on author pages when the author has no posts.
It is published under the GPL 2 licence (http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt).
The original idea was taken from the the “List Authors” plugin here: http://guff.szub.net/source/custom-list-authors.php

Show authors without posts

Shows the authors page even if the author has no post.

Latest Posts by Author vs Show authors without posts