Full Text Feed Ronald Heft, Jr.
http://cavemonkey50.com/

This plugin fixes the problem with WordPress where articles are truncated in feeds if you use the ‘more’ command. Use it because readers abhor partial feeds that come in via feedburner.

Related Posts by Alexander Malov, Mike Lu & Jon Bourne
Helps your users discover all your great related articles. Makes the site sticky!

Post Templates by Category by Kaf Oseo
http://guff.szub.net/post-templates-by-category/

If you have writers working for you, this plugin helps track their earnings.

Simple Tagging by Amaury BALMER
http://simpletagging.herewithme.fr/

Helps you impregnate posts with tags on the fly. Boost your search engine rankings!

Spam Karma 2 by dr Dave
http://unknowngenius.com/blog/wordpress/spam-karma/

The best anti-spam plugin, which provides total protection. Leaves Askimet in the dust