Skyy

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.

WP-Ban-User

anmari

This plugin allows one to personalise content for a logged in user. It uses shortcode type functionality in any email template or page or post. It extract stored details of the viewer or reader. A default text can be specified for situations where there are no stored details.
It also allows you to customise the email address that wordpress uses to send the emails, and the sender name. This can allow you to offer a more customised service for example with a more helpful unsubscribe link. Or you could create your own “profile” page for logged in users only.
Plugin homepage: <a href="http://wpusersplugin.com/personalise/" rel="nofollow ugc">http://wpusersplugin.com/personalise/</a> 
Demo page: <a href="http://test.icalevents.com/personalise/" rel="nofollow ugc">http://test.icalevents.com/personalise/</a>

amr personalise

This plugin allows one to personalise pages, posts or wordpress single user emails.

WP-Ban-User vs amr personalise