A simple solution to misbehaving users.

Author:blueskyy (profile at wordpress.org)
WordPress version required:2.0.2
WordPress version tested:2.9.2
Plugin version:1.0
Added to WordPress repository:03-05-2010
Last updated:03-05-2010
Warning! This plugin has not been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
Rating, %:0
Rated by:0
Plugin URI:http://wpban.cz.cc/demo/
Total downloads:3 605
Active installs:20+
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This plugin allows you to banned certain username from making comment, particularly when you don't want to ban ip addresses, but want to stop certain "notorious" misbehaving users.

If your blog requires user registration, you should really try the "members.0.1.1" wordpress plugin.